diff --git a/orchestrator/src/client/api/client.ts b/orchestrator/src/client/api/client.ts
index 049042e..7597775 100644
--- a/orchestrator/src/client/api/client.ts
+++ b/orchestrator/src/client/api/client.ts
@@ -472,23 +472,6 @@ export async function listJobChatThreads(jobId: string): Promise<{
   return fetchApi<{ threads: JobChatThread[] }>(`/jobs/${jobId}/chat/threads`);
 }
 
-export async function listJobGhostwriterMessages(
-  jobId: string,
-  options?: { limit?: number; offset?: number },
-): Promise<{ messages: JobChatMessage[] }> {
-  const params = new URLSearchParams();
-  if (typeof options?.limit === "number") {
-    params.set("limit", String(options.limit));
-  }
-  if (typeof options?.offset === "number") {
-    params.set("offset", String(options.offset));
-  }
-  const query = params.toString();
-  return fetchApi<{ messages: JobChatMessage[] }>(
-    `/jobs/${jobId}/chat/messages${query ? `?${query}` : ""}`,
-  );
-}
-
 export async function createJobChatThread(
   jobId: string,
   input?: { title?: string | null },
@@ -556,23 +539,6 @@ export async function streamJobChatMessage(
   );
 }
 
-export async function streamJobGhostwriterMessage(
-  jobId: string,
-  input: { content: string; signal?: AbortSignal },
-  handlers: {
-    onEvent: (event: JobChatStreamEvent) => void;
-  },
-): Promise<void> {
-  return streamSseEvents(
-    `/jobs/${jobId}/chat/messages`,
-    { content: input.content, stream: true },
-    {
-      onEvent: handlers.onEvent,
-      signal: input.signal,
-    },
-  );
-}
-
 export async function cancelJobChatRun(
   jobId: string,
   threadId: string,
@@ -587,19 +553,6 @@ export async function cancelJobChatRun(
   );
 }
 
-export async function cancelJobGhostwriterRun(
-  jobId: string,
-  runId: string,
-): Promise<{ cancelled: boolean; alreadyFinished: boolean }> {
-  return fetchApi<{ cancelled: boolean; alreadyFinished: boolean }>(
-    `/jobs/${jobId}/chat/runs/${runId}/cancel`,
-    {
-      method: "POST",
-      body: JSON.stringify({}),
-    },
-  );
-}
-
 export async function regenerateJobChatMessage(
   jobId: string,
   threadId: string,
@@ -633,24 +586,6 @@ export async function streamRegenerateJobChatMessage(
   );
 }
 
-export async function streamRegenerateJobGhostwriterMessage(
-  jobId: string,
-  assistantMessageId: string,
-  input: { signal?: AbortSignal },
-  handlers: {
-    onEvent: (event: JobChatStreamEvent) => void;
-  },
-): Promise<void> {
-  return streamSseEvents(
-    `/jobs/${jobId}/chat/messages/${assistantMessageId}/regenerate`,
-    { stream: true },
-    {
-      onEvent: handlers.onEvent,
-      signal: input.signal,
-    },
-  );
-}
-
 export async function processJob(
   id: string,
   options?: { force?: boolean },
diff --git a/orchestrator/src/client/components/job-chat/Composer.tsx b/orchestrator/src/client/components/job-chat/Composer.tsx
new file mode 100644
index 0000000..167744d
--- /dev/null
+++ b/orchestrator/src/client/components/job-chat/Composer.tsx
@@ -0,0 +1,52 @@
+import { Send } from "lucide-react";
+import type React from "react";
+import { useState } from "react";
+import { Button } from "@/components/ui/button";
+import { Textarea } from "@/components/ui/textarea";
+
+type ComposerProps = {
+  disabled?: boolean;
+  onSend: (content: string) => Promise<void>;
+};
+
+export const Composer: React.FC<ComposerProps> = ({ disabled, onSend }) => {
+  const [value, setValue] = useState("");
+
+  const submit = async () => {
+    const content = value.trim();
+    if (!content || disabled) return;
+    setValue("");
+    await onSend(content);
+  };
+
+  return (
+    <div className="space-y-2">
+      <Textarea
+        placeholder="Ask anything about this job..."
+        value={value}
+        onChange={(event) => setValue(event.target.value)}
+        disabled={disabled}
+        onKeyDown={(event) => {
+          if ((event.metaKey || event.ctrlKey) && event.key === "Enter") {
+            event.preventDefault();
+            void submit();
+          }
+        }}
+        className="min-h-[84px]"
+      />
+      <div className="flex items-center justify-between">
+        <div className="text-[10px] text-muted-foreground">
+          Cmd/Ctrl+Enter to send
+        </div>
+        <Button
+          size="sm"
+          onClick={() => void submit()}
+          disabled={disabled || !value.trim()}
+        >
+          <Send className="mr-1 h-3.5 w-3.5" />
+          Send
+        </Button>
+      </div>
+    </div>
+  );
+};
diff --git a/orchestrator/src/client/components/job-chat/JobChatPanel.tsx b/orchestrator/src/client/components/job-chat/JobChatPanel.tsx
new file mode 100644
index 0000000..f4fa604
--- /dev/null
+++ b/orchestrator/src/client/components/job-chat/JobChatPanel.tsx
@@ -0,0 +1,361 @@
+import type {
+  Job,
+  JobChatMessage,
+  JobChatStreamEvent,
+  JobChatThread,
+} from "@shared/types";
+import { MessageSquare } from "lucide-react";
+import type React from "react";
+import { useCallback, useEffect, useMemo, useRef, useState } from "react";
+import { toast } from "sonner";
+import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
+import * as api from "../../api";
+import { useSettings } from "../../hooks/useSettings";
+import { Composer } from "./Composer";
+import { MessageList } from "./MessageList";
+import { RunControls } from "./RunControls";
+import { ThreadList } from "./ThreadList";
+
+type JobChatPanelProps = {
+  job: Job;
+};
+
+export const JobChatPanel: React.FC<JobChatPanelProps> = ({ job }) => {
+  const { settings } = useSettings();
+  const enabled = settings?.jobChatEnabled ?? false;
+
+  const [threads, setThreads] = useState<JobChatThread[]>([]);
+  const [activeThreadId, setActiveThreadId] = useState<string | null>(null);
+  const [messages, setMessages] = useState<JobChatMessage[]>([]);
+  const [isLoading, setIsLoading] = useState(true);
+  const [isStreaming, setIsStreaming] = useState(false);
+  const [streamingMessageId, setStreamingMessageId] = useState<string | null>(
+    null,
+  );
+  const [activeRunId, setActiveRunId] = useState<string | null>(null);
+  const messageListRef = useRef<HTMLDivElement | null>(null);
+
+  const streamAbortRef = useRef<AbortController | null>(null);
+  const activeThreadIdRef = useRef<string | null>(null);
+
+  useEffect(() => {
+    activeThreadIdRef.current = activeThreadId;
+  }, [activeThreadId]);
+
+  useEffect(() => {
+    const container = messageListRef.current;
+    if (!container) return;
+    const distanceToBottom =
+      container.scrollHeight - container.scrollTop - container.clientHeight;
+    if (distanceToBottom < 120 || isStreaming) {
+      container.scrollTop = container.scrollHeight;
+    }
+  });
+
+  const loadThreadMessages = useCallback(
+    async (threadId: string) => {
+      const data = await api.listJobChatMessages(job.id, threadId, {
+        limit: 300,
+      });
+      setMessages(data.messages);
+    },
+    [job.id],
+  );
+
+  const createThread = useCallback(async () => {
+    const created = await api.createJobChatThread(job.id, {
+      title: `${job.title} @ ${job.employer}`,
+    });
+    setThreads((current) => [created.thread, ...current]);
+    setActiveThreadId(created.thread.id);
+    setMessages([]);
+    return created.thread;
+  }, [job.id, job.title, job.employer]);
+
+  const load = useCallback(async () => {
+    if (!enabled) {
+      setIsLoading(false);
+      return;
+    }
+
+    setIsLoading(true);
+    try {
+      const data = await api.listJobChatThreads(job.id);
+      const nextThreads = data.threads;
+      setThreads(nextThreads);
+
+      let threadId = nextThreads[0]?.id ?? null;
+      if (!threadId) {
+        const created = await createThread();
+        threadId = created.id;
+      }
+
+      setActiveThreadId(threadId);
+      if (threadId) {
+        await loadThreadMessages(threadId);
+      }
+    } catch (error) {
+      const message =
+        error instanceof Error ? error.message : "Failed to load job chat";
+      toast.error(message);
+    } finally {
+      setIsLoading(false);
+    }
+  }, [enabled, job.id, createThread, loadThreadMessages]);
+
+  useEffect(() => {
+    void load();
+    return () => {
+      streamAbortRef.current?.abort();
+      streamAbortRef.current = null;
+    };
+  }, [load]);
+
+  const onStreamEvent = useCallback(
+    (event: JobChatStreamEvent) => {
+      if (event.type === "ready") {
+        setActiveRunId(event.runId);
+        setStreamingMessageId(event.messageId);
+        setMessages((current) => {
+          if (current.some((message) => message.id === event.messageId))
+            return current;
+          return [
+            ...current,
+            {
+              id: event.messageId,
+              threadId: event.threadId,
+              jobId: job.id,
+              role: "assistant",
+              content: "",
+              status: "partial",
+              tokensIn: null,
+              tokensOut: null,
+              version: 1,
+              replacesMessageId: null,
+              createdAt: new Date().toISOString(),
+              updatedAt: new Date().toISOString(),
+            },
+          ];
+        });
+        return;
+      }
+
+      if (event.type === "delta") {
+        setMessages((current) =>
+          current.map((message) =>
+            message.id === event.messageId
+              ? {
+                  ...message,
+                  content: `${message.content}${event.delta}`,
+                  status: "partial",
+                  updatedAt: new Date().toISOString(),
+                }
+              : message,
+          ),
+        );
+        return;
+      }
+
+      if (event.type === "completed" || event.type === "cancelled") {
+        setMessages((current) => {
+          const next = current.filter(
+            (message) => message.id !== event.message.id,
+          );
+          return [...next, event.message].sort((a, b) =>
+            a.createdAt.localeCompare(b.createdAt),
+          );
+        });
+        setStreamingMessageId(null);
+        setActiveRunId(null);
+        setIsStreaming(false);
+        return;
+      }
+
+      if (event.type === "error") {
+        toast.error(event.message);
+        setStreamingMessageId(null);
+        setActiveRunId(null);
+        setIsStreaming(false);
+      }
+    },
+    [job.id],
+  );
+
+  const sendMessage = useCallback(
+    async (content: string) => {
+      if (!activeThreadIdRef.current || isStreaming) return;
+
+      const threadId = activeThreadIdRef.current;
+      const optimisticUser: JobChatMessage = {
+        id: `tmp-user-${Date.now()}`,
+        threadId,
+        jobId: job.id,
+        role: "user",
+        content,
+        status: "complete",
+        tokensIn: null,
+        tokensOut: null,
+        version: 1,
+        replacesMessageId: null,
+        createdAt: new Date().toISOString(),
+        updatedAt: new Date().toISOString(),
+      };
+
+      setMessages((current) => [...current, optimisticUser]);
+      setIsStreaming(true);
+
+      const controller = new AbortController();
+      streamAbortRef.current = controller;
+
+      try {
+        await api.streamJobChatMessage(
+          job.id,
+          threadId,
+          { content, signal: controller.signal },
+          { onEvent: onStreamEvent },
+        );
+
+        await loadThreadMessages(threadId);
+      } catch (error) {
+        if (error instanceof Error && error.name === "AbortError") {
+          return;
+        }
+
+        const message =
+          error instanceof Error ? error.message : "Failed to send message";
+        toast.error(message);
+      } finally {
+        streamAbortRef.current = null;
+        setIsStreaming(false);
+      }
+    },
+    [isStreaming, job.id, loadThreadMessages, onStreamEvent],
+  );
+
+  const stopStreaming = useCallback(async () => {
+    if (!activeThreadId || !activeRunId) return;
+    try {
+      await api.cancelJobChatRun(job.id, activeThreadId, activeRunId);
+      streamAbortRef.current?.abort();
+      streamAbortRef.current = null;
+      setIsStreaming(false);
+      setActiveRunId(null);
+      setStreamingMessageId(null);
+      await loadThreadMessages(activeThreadId);
+    } catch (error) {
+      const message =
+        error instanceof Error ? error.message : "Failed to stop run";
+      toast.error(message);
+    }
+  }, [activeThreadId, activeRunId, job.id, loadThreadMessages]);
+
+  const canRegenerate = useMemo(() => {
+    if (isStreaming || messages.length === 0) return false;
+    const last = messages[messages.length - 1];
+    return last.role === "assistant";
+  }, [isStreaming, messages]);
+
+  const regenerate = useCallback(async () => {
+    if (!activeThreadId || isStreaming || messages.length === 0) return;
+    const last = messages[messages.length - 1];
+    if (last.role !== "assistant") return;
+
+    setIsStreaming(true);
+    const controller = new AbortController();
+    streamAbortRef.current = controller;
+
+    try {
+      await api.streamRegenerateJobChatMessage(
+        job.id,
+        activeThreadId,
+        last.id,
+        { signal: controller.signal },
+        { onEvent: onStreamEvent },
+      );
+      await loadThreadMessages(activeThreadId);
+    } catch (error) {
+      if (error instanceof Error && error.name === "AbortError") {
+        return;
+      }
+      const message =
+        error instanceof Error
+          ? error.message
+          : "Failed to regenerate response";
+      toast.error(message);
+    } finally {
+      streamAbortRef.current = null;
+      setIsStreaming(false);
+    }
+  }, [
+    activeThreadId,
+    isStreaming,
+    job.id,
+    loadThreadMessages,
+    messages,
+    onStreamEvent,
+  ]);
+
+  if (!enabled) {
+    return (
+      <Card className="border-border/50">
+        <CardHeader>
+          <CardTitle className="flex items-center gap-2 text-base">
+            <MessageSquare className="h-4 w-4" />
+            Job Copilot
+          </CardTitle>
+        </CardHeader>
+        <CardContent className="text-sm text-muted-foreground">
+          Enable this in Settings → Job Chat Copilot.
+        </CardContent>
+      </Card>
+    );
+  }
+
+  return (
+    <Card className="border-border/50">
+      <CardHeader>
+        <CardTitle className="flex items-center gap-2 text-base">
+          <MessageSquare className="h-4 w-4" />
+          Job Copilot
+        </CardTitle>
+      </CardHeader>
+      <CardContent className="space-y-4">
+        <ThreadList
+          threads={threads}
+          activeThreadId={activeThreadId}
+          onSelectThread={(threadId) => {
+            setActiveThreadId(threadId);
+            void loadThreadMessages(threadId);
+          }}
+          onCreateThread={() => {
+            void createThread();
+          }}
+          disabled={isLoading || isStreaming}
+        />
+
+        <div
+          ref={messageListRef}
+          className="max-h-[420px] overflow-y-auto rounded-md border border-border/50 p-3"
+        >
+          <MessageList
+            messages={messages}
+            isStreaming={isStreaming}
+            streamingMessageId={streamingMessageId}
+          />
+        </div>
+
+        <RunControls
+          isStreaming={isStreaming}
+          canRegenerate={canRegenerate}
+          onStop={stopStreaming}
+          onRegenerate={regenerate}
+        />
+
+        <Composer
+          disabled={isLoading || isStreaming || !activeThreadId}
+          onSend={sendMessage}
+        />
+      </CardContent>
+    </Card>
+  );
+};
diff --git a/orchestrator/src/client/components/job-chat/MessageList.tsx b/orchestrator/src/client/components/job-chat/MessageList.tsx
new file mode 100644
index 0000000..5c4e29c
--- /dev/null
+++ b/orchestrator/src/client/components/job-chat/MessageList.tsx
@@ -0,0 +1,59 @@
+import type { JobChatMessage } from "@shared/types";
+import type React from "react";
+import { StreamingMessage } from "./StreamingMessage";
+
+type MessageListProps = {
+  messages: JobChatMessage[];
+  isStreaming: boolean;
+  streamingMessageId: string | null;
+};
+
+export const MessageList: React.FC<MessageListProps> = ({
+  messages,
+  isStreaming,
+  streamingMessageId,
+}) => {
+  return (
+    <div className="space-y-3">
+      {messages.length === 0 ? (
+        <div className="rounded-md border border-dashed border-border/60 p-3 text-xs text-muted-foreground">
+          Ask for interview prep, response drafts, or application strategy for
+          this job.
+        </div>
+      ) : (
+        messages.map((message) => {
+          const isUser = message.role === "user";
+          const isActiveStreaming =
+            isStreaming &&
+            message.role === "assistant" &&
+            streamingMessageId === message.id;
+
+          return (
+            <div
+              key={message.id}
+              className={`rounded-lg border p-3 ${
+                isUser
+                  ? "border-primary/30 bg-primary/5"
+                  : "border-border/60 bg-background"
+              }`}
+            >
+              <div className="mb-1 text-[10px] uppercase tracking-wide text-muted-foreground">
+                {isUser
+                  ? "You"
+                  : `Copilot${message.version > 1 ? ` v${message.version}` : ""}`}
+              </div>
+              {isActiveStreaming ? (
+                <StreamingMessage content={message.content} />
+              ) : (
+                <div className="whitespace-pre-wrap text-sm leading-relaxed text-foreground">
+                  {message.content ||
+                    (message.role === "assistant" ? "..." : "")}
+                </div>
+              )}
+            </div>
+          );
+        })
+      )}
+    </div>
+  );
+};
diff --git a/orchestrator/src/client/components/job-chat/RunControls.tsx b/orchestrator/src/client/components/job-chat/RunControls.tsx
new file mode 100644
index 0000000..d214384
--- /dev/null
+++ b/orchestrator/src/client/components/job-chat/RunControls.tsx
@@ -0,0 +1,45 @@
+import { Loader2, RefreshCcw, Square } from "lucide-react";
+import type React from "react";
+import { Button } from "@/components/ui/button";
+
+type RunControlsProps = {
+  isStreaming: boolean;
+  canRegenerate: boolean;
+  onStop: () => Promise<void>;
+  onRegenerate: () => Promise<void>;
+};
+
+export const RunControls: React.FC<RunControlsProps> = ({
+  isStreaming,
+  canRegenerate,
+  onStop,
+  onRegenerate,
+}) => {
+  return (
+    <div className="flex items-center justify-end gap-2">
+      {isStreaming ? (
+        <Button size="sm" variant="outline" onClick={() => void onStop()}>
+          <Square className="mr-1 h-3.5 w-3.5" />
+          Stop
+        </Button>
+      ) : (
+        <Button
+          size="sm"
+          variant="outline"
+          onClick={() => void onRegenerate()}
+          disabled={!canRegenerate}
+        >
+          <RefreshCcw className="mr-1 h-3.5 w-3.5" />
+          Regenerate
+        </Button>
+      )}
+
+      {isStreaming && (
+        <div className="inline-flex items-center gap-1 text-xs text-muted-foreground">
+          <Loader2 className="h-3.5 w-3.5 animate-spin" />
+          Generating
+        </div>
+      )}
+    </div>
+  );
+};
diff --git a/orchestrator/src/client/components/job-chat/StreamingMessage.tsx b/orchestrator/src/client/components/job-chat/StreamingMessage.tsx
new file mode 100644
index 0000000..05c94d9
--- /dev/null
+++ b/orchestrator/src/client/components/job-chat/StreamingMessage.tsx
@@ -0,0 +1,16 @@
+import type React from "react";
+
+type StreamingMessageProps = {
+  content: string;
+};
+
+export const StreamingMessage: React.FC<StreamingMessageProps> = ({
+  content,
+}) => {
+  return (
+    <div className="whitespace-pre-wrap text-sm leading-relaxed text-foreground">
+      {content}
+      <span className="ml-1 inline-block h-4 w-2 animate-pulse rounded bg-primary/60 align-middle" />
+    </div>
+  );
+};
diff --git a/orchestrator/src/client/components/job-chat/ThreadList.tsx b/orchestrator/src/client/components/job-chat/ThreadList.tsx
new file mode 100644
index 0000000..07a7414
--- /dev/null
+++ b/orchestrator/src/client/components/job-chat/ThreadList.tsx
@@ -0,0 +1,62 @@
+import type { JobChatThread } from "@shared/types";
+import type React from "react";
+import { Button } from "@/components/ui/button";
+import { cn } from "@/lib/utils";
+
+type ThreadListProps = {
+  threads: JobChatThread[];
+  activeThreadId: string | null;
+  onSelectThread: (threadId: string) => void;
+  onCreateThread: () => void;
+  disabled?: boolean;
+};
+
+export const ThreadList: React.FC<ThreadListProps> = ({
+  threads,
+  activeThreadId,
+  onSelectThread,
+  onCreateThread,
+  disabled,
+}) => {
+  return (
+    <div className="space-y-2">
+      <div className="flex items-center justify-between">
+        <div className="text-xs uppercase tracking-wide text-muted-foreground">
+          Threads
+        </div>
+        <Button
+          size="sm"
+          variant="outline"
+          onClick={onCreateThread}
+          disabled={disabled}
+        >
+          New
+        </Button>
+      </div>
+
+      <div className="max-h-40 space-y-1 overflow-auto rounded-md border border-border/50 p-1">
+        {threads.length === 0 ? (
+          <div className="p-2 text-xs text-muted-foreground">
+            No threads yet
+          </div>
+        ) : (
+          threads.map((thread) => (
+            <button
+              key={thread.id}
+              type="button"
+              onClick={() => onSelectThread(thread.id)}
+              className={cn(
+                "w-full rounded px-2 py-1.5 text-left text-xs transition-colors",
+                activeThreadId === thread.id
+                  ? "bg-primary/10 text-primary"
+                  : "hover:bg-muted",
+              )}
+            >
+              {thread.title || "Untitled thread"}
+            </button>
+          ))
+        )}
+      </div>
+    </div>
+  );
+};
diff --git a/orchestrator/src/client/pages/JobPage.tsx b/orchestrator/src/client/pages/JobPage.tsx
index 46cb0d5..f01e394 100644
--- a/orchestrator/src/client/pages/JobPage.tsx
+++ b/orchestrator/src/client/pages/JobPage.tsx
@@ -25,6 +25,7 @@ import * as api from "../api";
 import { ConfirmDelete } from "../components/ConfirmDelete";
 import { GhostwriterDrawer } from "../components/ghostwriter/GhostwriterDrawer";
 import { JobHeader } from "../components/JobHeader";
+import { JobChatPanel } from "../components/job-chat/JobChatPanel";
 import {
   type LogEventFormValues,
   LogEventModal,
@@ -352,6 +353,8 @@ export const JobPage: React.FC = () => {
               </CardContent>
             </Card>
           )}
+
+          {job && <JobChatPanel job={job} />}
         </div>
       </div>
 
diff --git a/orchestrator/src/client/pages/SettingsPage.tsx b/orchestrator/src/client/pages/SettingsPage.tsx
index 66f80c1..8e7766f 100644
--- a/orchestrator/src/client/pages/SettingsPage.tsx
+++ b/orchestrator/src/client/pages/SettingsPage.tsx
@@ -47,6 +47,7 @@ const DEFAULT_FORM_VALUES: UpdateSettingsInput = {
   resumeProjects: null,
   rxresumeBaseResumeId: null,
   showSponsorInfo: null,
+  jobChatEnabled: null,
   chatStyleTone: "",
   chatStyleFormality: "",
   chatStyleConstraints: "",
@@ -86,6 +87,7 @@ const NULL_SETTINGS_PAYLOAD: UpdateSettingsInput = {
   resumeProjects: null,
   rxresumeBaseResumeId: null,
   showSponsorInfo: null,
+  jobChatEnabled: null,
   chatStyleTone: null,
   chatStyleFormality: null,
   chatStyleConstraints: null,
@@ -119,6 +121,7 @@ const mapSettingsToForm = (data: AppSettings): UpdateSettingsInput => ({
   resumeProjects: data.resumeProjects,
   rxresumeBaseResumeId: data.rxresumeBaseResumeId ?? null,
   showSponsorInfo: data.overrideShowSponsorInfo,
+  jobChatEnabled: data.overrideJobChatEnabled,
   chatStyleTone: data.overrideChatStyleTone ?? "",
   chatStyleFormality: data.overrideChatStyleFormality ?? "",
   chatStyleConstraints: data.overrideChatStyleConstraints ?? "",
@@ -214,6 +217,10 @@ const getDerivedSettings = (settings: AppSettings | null) => {
       default: settings?.defaultShowSponsorInfo ?? true,
     },
     chat: {
+      enabled: {
+        effective: settings?.jobChatEnabled ?? false,
+        default: settings?.defaultJobChatEnabled ?? false,
+      },
       tone: {
         effective: settings?.chatStyleTone ?? "professional",
         default: settings?.defaultChatStyleTone ?? "professional",
@@ -583,6 +590,7 @@ export const SettingsPage: React.FC = () => {
         resumeProjects: resumeProjectsOverride,
         rxresumeBaseResumeId: normalizeString(data.rxresumeBaseResumeId),
         showSponsorInfo: nullIfSame(data.showSponsorInfo, display.default),
+        jobChatEnabled: nullIfSame(data.jobChatEnabled, chat.enabled.default),
         chatStyleTone: normalizeString(data.chatStyleTone),
         chatStyleFormality: normalizeString(data.chatStyleFormality),
         chatStyleConstraints: normalizeString(data.chatStyleConstraints),
diff --git a/orchestrator/src/client/pages/settings/components/ChatSettingsSection.tsx b/orchestrator/src/client/pages/settings/components/ChatSettingsSection.tsx
index 812a825..092e64c 100644
--- a/orchestrator/src/client/pages/settings/components/ChatSettingsSection.tsx
+++ b/orchestrator/src/client/pages/settings/components/ChatSettingsSection.tsx
@@ -8,6 +8,7 @@ import {
   AccordionItem,
   AccordionTrigger,
 } from "@/components/ui/accordion";
+import { Checkbox } from "@/components/ui/checkbox";
 import {
   Select,
   SelectContent,
@@ -28,17 +29,51 @@ export const ChatSettingsSection: React.FC<ChatSettingsSectionProps> = ({
   isLoading,
   isSaving,
 }) => {
-  const { tone, formality, constraints, doNotUse } = values;
+  const { enabled, tone, formality, constraints, doNotUse } = values;
 
-  const { control, register } = useFormContext<UpdateSettingsInput>();
+  const { control, register, watch } = useFormContext<UpdateSettingsInput>();
+  const isEnabled = watch("jobChatEnabled") ?? enabled.default;
 
   return (
     <AccordionItem value="chat" className="border rounded-lg px-4">
       <AccordionTrigger className="hover:no-underline py-4">
-        <span className="text-base font-semibold">Ghostwriter</span>
+        <span className="text-base font-semibold">Job Chat Copilot</span>
       </AccordionTrigger>
       <AccordionContent className="pb-4">
         <div className="space-y-4">
+          <div className="flex items-start space-x-3">
+            <Controller
+              name="jobChatEnabled"
+              control={control}
+              render={({ field }) => (
+                <Checkbox
+                  id="jobChatEnabled"
+                  checked={field.value ?? enabled.default}
+                  onCheckedChange={(checked) => {
+                    field.onChange(
+                      checked === "indeterminate" ? null : checked === true,
+                    );
+                  }}
+                  disabled={isLoading || isSaving}
+                />
+              )}
+            />
+            <div className="flex flex-col gap-1.5">
+              <label
+                htmlFor="jobChatEnabled"
+                className="text-sm font-medium leading-none cursor-pointer"
+              >
+                Enable per-job copilot chat
+              </label>
+              <p className="text-xs text-muted-foreground">
+                Adds a persistent chat thread on each job page with prefilled
+                job and profile context.
+              </p>
+            </div>
+          </div>
+
+          <Separator />
+
           <div className="grid gap-4 md:grid-cols-2">
             <div className="space-y-2">
               <label htmlFor="chatStyleTone" className="text-sm font-medium">
@@ -49,9 +84,9 @@ export const ChatSettingsSection: React.FC<ChatSettingsSectionProps> = ({
                 control={control}
                 render={({ field }) => (
                   <Select
-                    value={field.value || tone.default}
+                    value={field.value ?? tone.default}
                     onValueChange={(value) => field.onChange(value)}
-                    disabled={isLoading || isSaving}
+                    disabled={isLoading || isSaving || !isEnabled}
                   >
                     <SelectTrigger id="chatStyleTone">
                       <SelectValue placeholder="Select tone" />
@@ -79,9 +114,9 @@ export const ChatSettingsSection: React.FC<ChatSettingsSectionProps> = ({
                 control={control}
                 render={({ field }) => (
                   <Select
-                    value={field.value || formality.default}
+                    value={field.value ?? formality.default}
                     onValueChange={(value) => field.onChange(value)}
-                    disabled={isLoading || isSaving}
+                    disabled={isLoading || isSaving || !isEnabled}
                   >
                     <SelectTrigger id="chatStyleFormality">
                       <SelectValue placeholder="Select formality" />
@@ -101,8 +136,8 @@ export const ChatSettingsSection: React.FC<ChatSettingsSectionProps> = ({
             label="Constraints"
             inputProps={register("chatStyleConstraints")}
             placeholder="Example: keep answers under 120 words and include bullet points"
-            disabled={isLoading || isSaving}
-            helper="Optional global writing constraints used by Ghostwriter replies."
+            disabled={isLoading || isSaving || !isEnabled}
+            helper="Optional global writing constraints used by job chat replies."
             current={constraints.effective || "—"}
           />
 
@@ -110,7 +145,7 @@ export const ChatSettingsSection: React.FC<ChatSettingsSectionProps> = ({
             label="Do-not-use terms"
             inputProps={register("chatStyleDoNotUse")}
             placeholder="Example: synergize, leverage"
-            disabled={isLoading || isSaving}
+            disabled={isLoading || isSaving || !isEnabled}
             helper="Optional comma-separated words or phrases to avoid."
             current={doNotUse.effective || "—"}
           />
@@ -118,6 +153,13 @@ export const ChatSettingsSection: React.FC<ChatSettingsSectionProps> = ({
           <Separator />
 
           <div className="grid gap-2 text-sm sm:grid-cols-2">
+            <div>
+              <div className="text-xs text-muted-foreground">Enabled</div>
+              <div className="break-words font-mono text-xs">
+                Effective: {enabled.effective ? "Yes" : "No"} | Default:{" "}
+                {enabled.default ? "Yes" : "No"}
+              </div>
+            </div>
             <div>
               <div className="text-xs text-muted-foreground">Tone</div>
               <div className="break-words font-mono text-xs">
diff --git a/orchestrator/src/client/pages/settings/types.ts b/orchestrator/src/client/pages/settings/types.ts
index cc2af77..4955871 100644
--- a/orchestrator/src/client/pages/settings/types.ts
+++ b/orchestrator/src/client/pages/settings/types.ts
@@ -15,6 +15,7 @@ export type ModelValues = EffectiveDefault<string> & {
 export type WebhookValues = EffectiveDefault<string>;
 export type DisplayValues = EffectiveDefault<boolean>;
 export type ChatValues = {
+  enabled: EffectiveDefault<boolean>;
   tone: EffectiveDefault<string>;
   formality: EffectiveDefault<string>;
   constraints: EffectiveDefault<string>;
diff --git a/orchestrator/src/server/api/routes.ts b/orchestrator/src/server/api/routes.ts
index 5abfd19..c17f344 100644
--- a/orchestrator/src/server/api/routes.ts
+++ b/orchestrator/src/server/api/routes.ts
@@ -6,7 +6,7 @@ import { Router } from "express";
 import { backupRouter } from "./routes/backup";
 import { databaseRouter } from "./routes/database";
 import { demoRouter } from "./routes/demo";
-import { ghostwriterRouter } from "./routes/ghostwriter";
+import { jobChatRouter } from "./routes/job-chat";
 import { jobsRouter } from "./routes/jobs";
 import { manualJobsRouter } from "./routes/manual-jobs";
 import { onboardingRouter } from "./routes/onboarding";
@@ -21,7 +21,7 @@ import { webhookRouter } from "./routes/webhook";
 export const apiRouter = Router();
 
 apiRouter.use("/jobs", jobsRouter);
-apiRouter.use("/jobs/:id/chat", ghostwriterRouter);
+apiRouter.use("/jobs/:id/chat", jobChatRouter);
 apiRouter.use("/demo", demoRouter);
 apiRouter.use("/settings", settingsRouter);
 apiRouter.use("/pipeline", pipelineRouter);
diff --git a/orchestrator/src/server/api/routes/job-chat.test.ts b/orchestrator/src/server/api/routes/job-chat.test.ts
new file mode 100644
index 0000000..46a3bc8
--- /dev/null
+++ b/orchestrator/src/server/api/routes/job-chat.test.ts
@@ -0,0 +1,154 @@
+import type { Server } from "node:http";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { startServer, stopServer } from "./test-utils";
+
+vi.mock("../../services/job-chat", () => ({
+  listThreads: vi.fn(async () => [
+    {
+      id: "thread-1",
+      jobId: "job-1",
+      title: "Thread",
+      createdAt: new Date().toISOString(),
+      updatedAt: new Date().toISOString(),
+      lastMessageAt: new Date().toISOString(),
+    },
+  ]),
+  createThread: vi.fn(
+    async (input: { jobId: string; title?: string | null }) => ({
+      id: "thread-created",
+      jobId: input.jobId,
+      title: input.title ?? null,
+      createdAt: new Date().toISOString(),
+      updatedAt: new Date().toISOString(),
+      lastMessageAt: null,
+    }),
+  ),
+  listMessages: vi.fn(async () => [
+    {
+      id: "message-1",
+      threadId: "thread-1",
+      jobId: "job-1",
+      role: "user",
+      content: "hello",
+      status: "complete",
+      tokensIn: 1,
+      tokensOut: null,
+      version: 1,
+      replacesMessageId: null,
+      createdAt: new Date().toISOString(),
+      updatedAt: new Date().toISOString(),
+    },
+  ]),
+  sendMessage: vi.fn(async () => ({
+    userMessage: {
+      id: "user-1",
+      threadId: "thread-1",
+      jobId: "job-1",
+      role: "user",
+      content: "hello",
+      status: "complete",
+      tokensIn: 1,
+      tokensOut: null,
+      version: 1,
+      replacesMessageId: null,
+      createdAt: new Date().toISOString(),
+      updatedAt: new Date().toISOString(),
+    },
+    assistantMessage: {
+      id: "assistant-1",
+      threadId: "thread-1",
+      jobId: "job-1",
+      role: "assistant",
+      content: "hi",
+      status: "complete",
+      tokensIn: 1,
+      tokensOut: 1,
+      version: 1,
+      replacesMessageId: null,
+      createdAt: new Date().toISOString(),
+      updatedAt: new Date().toISOString(),
+    },
+    runId: "run-1",
+  })),
+  cancelRun: vi.fn(async () => ({ cancelled: true, alreadyFinished: false })),
+  regenerateMessage: vi.fn(async () => ({
+    runId: "run-2",
+    assistantMessage: {
+      id: "assistant-2",
+      threadId: "thread-1",
+      jobId: "job-1",
+      role: "assistant",
+      content: "updated",
+      status: "complete",
+      tokensIn: 1,
+      tokensOut: 1,
+      version: 2,
+      replacesMessageId: "assistant-1",
+      createdAt: new Date().toISOString(),
+      updatedAt: new Date().toISOString(),
+    },
+  })),
+}));
+
+describe.sequential("Job Chat API", () => {
+  let server: Server;
+  let baseUrl: string;
+  let closeDb: () => void;
+  let tempDir: string;
+
+  beforeEach(async () => {
+    ({ server, baseUrl, closeDb, tempDir } = await startServer());
+  });
+
+  afterEach(async () => {
+    await stopServer({ server, closeDb, tempDir });
+  });
+
+  it("lists threads with request id metadata", async () => {
+    const res = await fetch(`${baseUrl}/api/jobs/job-1/chat/threads`, {
+      headers: {
+        "x-request-id": "chat-req-1",
+      },
+    });
+    const body = await res.json();
+
+    expect(res.status).toBe(200);
+    expect(res.headers.get("x-request-id")).toBe("chat-req-1");
+    expect(body.ok).toBe(true);
+    expect(body.data.threads.length).toBe(1);
+    expect(body.meta.requestId).toBe("chat-req-1");
+  });
+
+  it("creates thread and sends a message", async () => {
+    const threadRes = await fetch(`${baseUrl}/api/jobs/job-1/chat/threads`, {
+      method: "POST",
+      headers: {
+        "Content-Type": "application/json",
+      },
+      body: JSON.stringify({ title: "My thread" }),
+    });
+    const threadBody = await threadRes.json();
+
+    expect(threadRes.status).toBe(201);
+    expect(threadBody.ok).toBe(true);
+    expect(threadBody.data.thread.id).toBe("thread-created");
+
+    const messageRes = await fetch(
+      `${baseUrl}/api/jobs/job-1/chat/threads/thread-1/messages`,
+      {
+        method: "POST",
+        headers: {
+          "Content-Type": "application/json",
+        },
+        body: JSON.stringify({ content: "hello" }),
+      },
+    );
+    const messageBody = await messageRes.json();
+
+    expect(messageRes.status).toBe(200);
+    expect(messageBody.ok).toBe(true);
+    expect(messageBody.data.runId).toBe("run-1");
+    expect(messageBody.data.assistantMessage.role).toBe("assistant");
+    expect(typeof messageBody.meta.requestId).toBe("string");
+  });
+});
diff --git a/orchestrator/src/server/api/routes/job-chat.ts b/orchestrator/src/server/api/routes/job-chat.ts
new file mode 100644
index 0000000..c160250
--- /dev/null
+++ b/orchestrator/src/server/api/routes/job-chat.ts
@@ -0,0 +1,318 @@
+import { asyncRoute, fail, ok } from "@infra/http";
+import { runWithRequestContext } from "@infra/request-context";
+import { badRequest, toAppError } from "@server/infra/errors";
+import { type Request, type Response, Router } from "express";
+import { z } from "zod";
+import * as jobChatService from "../../services/job-chat";
+
+export const jobChatRouter = Router({ mergeParams: true });
+
+const createThreadSchema = z.object({
+  title: z.string().trim().max(200).nullable().optional(),
+});
+
+const listMessagesQuerySchema = z.object({
+  limit: z.coerce.number().int().min(1).max(500).optional(),
+  offset: z.coerce.number().int().min(0).max(10000).optional(),
+});
+
+const sendMessageSchema = z.object({
+  content: z.string().trim().min(1).max(20000),
+  stream: z.boolean().optional(),
+});
+
+const regenerateSchema = z.object({
+  stream: z.boolean().optional(),
+});
+
+function getJobId(req: Request): string {
+  const jobId = req.params.id;
+  if (!jobId) {
+    throw badRequest("Missing job id");
+  }
+  return jobId;
+}
+
+function writeSse(res: Response, event: unknown): void {
+  res.write(`data: ${JSON.stringify(event)}\n\n`);
+}
+
+jobChatRouter.get(
+  "/threads",
+  asyncRoute(async (req, res) => {
+    const jobId = getJobId(req);
+
+    await runWithRequestContext({ jobId }, async () => {
+      const threads = await jobChatService.listThreads(jobId);
+      ok(res, { threads });
+    });
+  }),
+);
+
+jobChatRouter.post(
+  "/threads",
+  asyncRoute(async (req, res) => {
+    const jobId = getJobId(req);
+    const parsed = createThreadSchema.safeParse(req.body);
+    if (!parsed.success) {
+      return fail(
+        res,
+        badRequest(parsed.error.message, parsed.error.flatten()),
+      );
+    }
+
+    await runWithRequestContext({ jobId }, async () => {
+      const thread = await jobChatService.createThread({
+        jobId,
+        title: parsed.data.title,
+      });
+      ok(res, { thread }, 201);
+    });
+  }),
+);
+
+jobChatRouter.get(
+  "/threads/:threadId/messages",
+  asyncRoute(async (req, res) => {
+    const jobId = getJobId(req);
+    const threadId = req.params.threadId;
+    if (!threadId) {
+      return fail(res, badRequest("Missing thread id"));
+    }
+
+    const parsed = listMessagesQuerySchema.safeParse(req.query);
+    if (!parsed.success) {
+      return fail(
+        res,
+        badRequest(parsed.error.message, parsed.error.flatten()),
+      );
+    }
+
+    await runWithRequestContext({ jobId }, async () => {
+      const messages = await jobChatService.listMessages({
+        jobId,
+        threadId,
+        limit: parsed.data.limit,
+        offset: parsed.data.offset,
+      });
+      ok(res, { messages });
+    });
+  }),
+);
+
+jobChatRouter.post(
+  "/threads/:threadId/messages",
+  asyncRoute(async (req, res) => {
+    const jobId = getJobId(req);
+    const threadId = req.params.threadId;
+    if (!threadId) {
+      return fail(res, badRequest("Missing thread id"));
+    }
+
+    const parsed = sendMessageSchema.safeParse(req.body);
+    if (!parsed.success) {
+      return fail(
+        res,
+        badRequest(parsed.error.message, parsed.error.flatten()),
+      );
+    }
+
+    await runWithRequestContext({ jobId }, async () => {
+      if (parsed.data.stream) {
+        res.status(200);
+        res.setHeader("Content-Type", "text/event-stream");
+        res.setHeader("Cache-Control", "no-cache, no-transform");
+        res.setHeader("Connection", "keep-alive");
+        res.flushHeaders?.();
+
+        try {
+          await jobChatService.sendMessage({
+            jobId,
+            threadId,
+            content: parsed.data.content,
+            stream: {
+              onReady: ({ runId, messageId, requestId }) =>
+                writeSse(res, {
+                  type: "ready",
+                  runId,
+                  threadId,
+                  messageId,
+                  requestId,
+                }),
+              onDelta: ({ runId, messageId, delta }) =>
+                writeSse(res, {
+                  type: "delta",
+                  runId,
+                  messageId,
+                  delta,
+                }),
+              onCompleted: ({ runId, message }) =>
+                writeSse(res, {
+                  type: "completed",
+                  runId,
+                  message,
+                }),
+              onCancelled: ({ runId, message }) =>
+                writeSse(res, {
+                  type: "cancelled",
+                  runId,
+                  message,
+                }),
+              onError: ({ runId, code, message, requestId }) =>
+                writeSse(res, {
+                  type: "error",
+                  runId,
+                  code,
+                  message,
+                  requestId,
+                }),
+            },
+          });
+        } catch (error) {
+          const appError = toAppError(error);
+          writeSse(res, {
+            type: "error",
+            code: appError.code,
+            message: appError.message,
+            requestId: res.getHeader("x-request-id") || "unknown",
+          });
+        } finally {
+          res.end();
+        }
+
+        return;
+      }
+
+      const result = await jobChatService.sendMessage({
+        jobId,
+        threadId,
+        content: parsed.data.content,
+      });
+
+      ok(res, {
+        userMessage: result.userMessage,
+        assistantMessage: result.assistantMessage,
+        runId: result.runId,
+      });
+    });
+  }),
+);
+
+jobChatRouter.post(
+  "/threads/:threadId/runs/:runId/cancel",
+  asyncRoute(async (req, res) => {
+    const jobId = getJobId(req);
+    const threadId = req.params.threadId;
+    const runId = req.params.runId;
+
+    if (!threadId || !runId) {
+      return fail(res, badRequest("Missing thread id or run id"));
+    }
+
+    await runWithRequestContext({ jobId }, async () => {
+      const result = await jobChatService.cancelRun({
+        jobId,
+        threadId,
+        runId,
+      });
+
+      ok(res, result);
+    });
+  }),
+);
+
+jobChatRouter.post(
+  "/threads/:threadId/messages/:assistantMessageId/regenerate",
+  asyncRoute(async (req, res) => {
+    const jobId = getJobId(req);
+    const threadId = req.params.threadId;
+    const assistantMessageId = req.params.assistantMessageId;
+
+    if (!threadId || !assistantMessageId) {
+      return fail(res, badRequest("Missing thread id or message id"));
+    }
+
+    const parsed = regenerateSchema.safeParse(req.body ?? {});
+    if (!parsed.success) {
+      return fail(
+        res,
+        badRequest(parsed.error.message, parsed.error.flatten()),
+      );
+    }
+
+    await runWithRequestContext({ jobId }, async () => {
+      if (parsed.data.stream) {
+        res.status(200);
+        res.setHeader("Content-Type", "text/event-stream");
+        res.setHeader("Cache-Control", "no-cache, no-transform");
+        res.setHeader("Connection", "keep-alive");
+        res.flushHeaders?.();
+
+        try {
+          await jobChatService.regenerateMessage({
+            jobId,
+            threadId,
+            assistantMessageId,
+            stream: {
+              onReady: ({ runId, messageId, requestId }) =>
+                writeSse(res, {
+                  type: "ready",
+                  runId,
+                  threadId,
+                  messageId,
+                  requestId,
+                }),
+              onDelta: ({ runId, messageId, delta }) =>
+                writeSse(res, {
+                  type: "delta",
+                  runId,
+                  messageId,
+                  delta,
+                }),
+              onCompleted: ({ runId, message }) =>
+                writeSse(res, {
+                  type: "completed",
+                  runId,
+                  message,
+                }),
+              onCancelled: ({ runId, message }) =>
+                writeSse(res, {
+                  type: "cancelled",
+                  runId,
+                  message,
+                }),
+              onError: ({ runId, code, message, requestId }) =>
+                writeSse(res, {
+                  type: "error",
+                  runId,
+                  code,
+                  message,
+                  requestId,
+                }),
+            },
+          });
+        } catch (error) {
+          const appError = toAppError(error);
+          writeSse(res, {
+            type: "error",
+            code: appError.code,
+            message: appError.message,
+            requestId: res.getHeader("x-request-id") || "unknown",
+          });
+        } finally {
+          res.end();
+        }
+
+        return;
+      }
+
+      const result = await jobChatService.regenerateMessage({
+        jobId,
+        threadId,
+        assistantMessageId,
+      });
+
+      ok(res, result);
+    });
+  }),
+);
diff --git a/orchestrator/src/server/db/migrate.ts b/orchestrator/src/server/db/migrate.ts
index cd73cec..32ac22a 100644
--- a/orchestrator/src/server/db/migrate.ts
+++ b/orchestrator/src/server/db/migrate.ts
@@ -451,25 +451,6 @@ const migrations = [
   `CREATE INDEX IF NOT EXISTS idx_job_chat_threads_job_updated ON job_chat_threads(job_id, updated_at)`,
   `CREATE INDEX IF NOT EXISTS idx_job_chat_messages_thread_created ON job_chat_messages(thread_id, created_at)`,
   `CREATE INDEX IF NOT EXISTS idx_job_chat_runs_thread_status ON job_chat_runs(thread_id, status)`,
-  // Ensure only one running run per thread; backfill any duplicates first.
-  `WITH ranked AS (
-      SELECT
-        id,
-        ROW_NUMBER() OVER (PARTITION BY thread_id ORDER BY started_at DESC, id DESC) AS rank_in_thread
-      FROM job_chat_runs
-      WHERE status = 'running'
-    )
-    UPDATE job_chat_runs
-    SET
-      status = 'failed',
-      error_code = COALESCE(error_code, 'CONFLICT'),
-      error_message = COALESCE(error_message, 'Recovered duplicate running run during migration'),
-      completed_at = COALESCE(completed_at, CAST(strftime('%s', 'now') AS INTEGER) * 1000),
-      updated_at = datetime('now')
-    WHERE id IN (SELECT id FROM ranked WHERE rank_in_thread > 1)`,
-  `CREATE UNIQUE INDEX IF NOT EXISTS idx_job_chat_runs_thread_running_unique
-   ON job_chat_runs(thread_id)
-   WHERE status = 'running'`,
 
   // Backfill: Create "Applied" events for legacy jobs that have applied_at set but no event entry
   `INSERT INTO stage_events (id, application_id, title, from_stage, to_stage, occurred_at, metadata)
diff --git a/orchestrator/src/server/repositories/job-chat.ts b/orchestrator/src/server/repositories/job-chat.ts
new file mode 100644
index 0000000..3124c03
--- /dev/null
+++ b/orchestrator/src/server/repositories/job-chat.ts
@@ -0,0 +1,329 @@
+import { randomUUID } from "node:crypto";
+import type {
+  JobChatMessage,
+  JobChatMessageRole,
+  JobChatMessageStatus,
+  JobChatRun,
+  JobChatRunStatus,
+  JobChatThread,
+} from "@shared/types";
+import { and, desc, eq } from "drizzle-orm";
+import { db, schema } from "../db";
+
+const { jobChatMessages, jobChatRuns, jobChatThreads } = schema;
+
+function mapThread(row: typeof jobChatThreads.$inferSelect): JobChatThread {
+  return {
+    id: row.id,
+    jobId: row.jobId,
+    title: row.title,
+    createdAt: row.createdAt,
+    updatedAt: row.updatedAt,
+    lastMessageAt: row.lastMessageAt,
+  };
+}
+
+function mapMessage(row: typeof jobChatMessages.$inferSelect): JobChatMessage {
+  return {
+    id: row.id,
+    threadId: row.threadId,
+    jobId: row.jobId,
+    role: row.role as JobChatMessageRole,
+    content: row.content,
+    status: row.status as JobChatMessageStatus,
+    tokensIn: row.tokensIn,
+    tokensOut: row.tokensOut,
+    version: row.version,
+    replacesMessageId: row.replacesMessageId,
+    createdAt: row.createdAt,
+    updatedAt: row.updatedAt,
+  };
+}
+
+function mapRun(row: typeof jobChatRuns.$inferSelect): JobChatRun {
+  return {
+    id: row.id,
+    threadId: row.threadId,
+    jobId: row.jobId,
+    status: row.status as JobChatRunStatus,
+    model: row.model,
+    provider: row.provider,
+    errorCode: row.errorCode,
+    errorMessage: row.errorMessage,
+    startedAt: row.startedAt,
+    completedAt: row.completedAt,
+    requestId: row.requestId,
+    createdAt: row.createdAt,
+    updatedAt: row.updatedAt,
+  };
+}
+
+export async function listThreadsForJob(
+  jobId: string,
+): Promise<JobChatThread[]> {
+  const rows = await db
+    .select()
+    .from(jobChatThreads)
+    .where(eq(jobChatThreads.jobId, jobId))
+    .orderBy(desc(jobChatThreads.updatedAt));
+
+  return rows.map(mapThread);
+}
+
+export async function getThreadById(
+  threadId: string,
+): Promise<JobChatThread | null> {
+  const [row] = await db
+    .select()
+    .from(jobChatThreads)
+    .where(eq(jobChatThreads.id, threadId));
+  return row ? mapThread(row) : null;
+}
+
+export async function getThreadForJob(
+  jobId: string,
+  threadId: string,
+): Promise<JobChatThread | null> {
+  const [row] = await db
+    .select()
+    .from(jobChatThreads)
+    .where(
+      and(eq(jobChatThreads.id, threadId), eq(jobChatThreads.jobId, jobId)),
+    );
+  return row ? mapThread(row) : null;
+}
+
+export async function createThread(input: {
+  jobId: string;
+  title?: string | null;
+}): Promise<JobChatThread> {
+  const id = randomUUID();
+  const now = new Date().toISOString();
+
+  await db.insert(jobChatThreads).values({
+    id,
+    jobId: input.jobId,
+    title: input.title ?? null,
+    createdAt: now,
+    updatedAt: now,
+    lastMessageAt: null,
+  });
+
+  const thread = await getThreadById(id);
+  if (!thread) {
+    throw new Error(`Failed to load created chat thread ${id}.`);
+  }
+  return thread;
+}
+
+export async function touchThread(
+  threadId: string,
+  lastMessageAt?: string,
+): Promise<void> {
+  const now = new Date().toISOString();
+  await db
+    .update(jobChatThreads)
+    .set({
+      updatedAt: now,
+      ...(lastMessageAt !== undefined ? { lastMessageAt } : {}),
+    })
+    .where(eq(jobChatThreads.id, threadId));
+}
+
+export async function listMessagesForThread(
+  threadId: string,
+  options?: { limit?: number; offset?: number },
+): Promise<JobChatMessage[]> {
+  const limit = options?.limit ?? 200;
+  const offset = options?.offset ?? 0;
+
+  const rows = await db
+    .select()
+    .from(jobChatMessages)
+    .where(eq(jobChatMessages.threadId, threadId))
+    .orderBy(jobChatMessages.createdAt)
+    .limit(limit)
+    .offset(offset);
+
+  return rows.map(mapMessage);
+}
+
+export async function getMessageById(
+  messageId: string,
+): Promise<JobChatMessage | null> {
+  const [row] = await db
+    .select()
+    .from(jobChatMessages)
+    .where(eq(jobChatMessages.id, messageId));
+  return row ? mapMessage(row) : null;
+}
+
+export async function createMessage(input: {
+  threadId: string;
+  jobId: string;
+  role: JobChatMessageRole;
+  content: string;
+  status?: JobChatMessageStatus;
+  tokensIn?: number | null;
+  tokensOut?: number | null;
+  version?: number;
+  replacesMessageId?: string | null;
+}): Promise<JobChatMessage> {
+  const id = randomUUID();
+  const now = new Date().toISOString();
+
+  await db.insert(jobChatMessages).values({
+    id,
+    threadId: input.threadId,
+    jobId: input.jobId,
+    role: input.role,
+    content: input.content,
+    status: input.status ?? "partial",
+    tokensIn: input.tokensIn ?? null,
+    tokensOut: input.tokensOut ?? null,
+    version: input.version ?? 1,
+    replacesMessageId: input.replacesMessageId ?? null,
+    createdAt: now,
+    updatedAt: now,
+  });
+
+  await touchThread(input.threadId, now);
+
+  const created = await getMessageById(id);
+  if (!created) {
+    throw new Error(`Failed to load created chat message ${id}.`);
+  }
+  return created;
+}
+
+export async function updateMessage(
+  messageId: string,
+  input: {
+    content?: string;
+    status?: JobChatMessageStatus;
+    tokensIn?: number | null;
+    tokensOut?: number | null;
+  },
+): Promise<JobChatMessage | null> {
+  const now = new Date().toISOString();
+
+  await db
+    .update(jobChatMessages)
+    .set({
+      ...(input.content !== undefined ? { content: input.content } : {}),
+      ...(input.status !== undefined ? { status: input.status } : {}),
+      ...(input.tokensIn !== undefined ? { tokensIn: input.tokensIn } : {}),
+      ...(input.tokensOut !== undefined ? { tokensOut: input.tokensOut } : {}),
+      updatedAt: now,
+    })
+    .where(eq(jobChatMessages.id, messageId));
+
+  const message = await getMessageById(messageId);
+  if (message) {
+    await touchThread(message.threadId, now);
+  }
+  return message;
+}
+
+export async function getLatestAssistantMessage(
+  threadId: string,
+): Promise<JobChatMessage | null> {
+  const [row] = await db
+    .select()
+    .from(jobChatMessages)
+    .where(
+      and(
+        eq(jobChatMessages.threadId, threadId),
+        eq(jobChatMessages.role, "assistant"),
+      ),
+    )
+    .orderBy(desc(jobChatMessages.createdAt))
+    .limit(1);
+
+  return row ? mapMessage(row) : null;
+}
+
+export async function createRun(input: {
+  threadId: string;
+  jobId: string;
+  model: string | null;
+  provider: string | null;
+  requestId?: string | null;
+}): Promise<JobChatRun> {
+  const id = randomUUID();
+  const startedAt = Date.now();
+  const now = new Date(startedAt).toISOString();
+
+  await db.insert(jobChatRuns).values({
+    id,
+    threadId: input.threadId,
+    jobId: input.jobId,
+    status: "running",
+    model: input.model,
+    provider: input.provider,
+    errorCode: null,
+    errorMessage: null,
+    startedAt,
+    completedAt: null,
+    requestId: input.requestId ?? null,
+    createdAt: now,
+    updatedAt: now,
+  });
+
+  const run = await getRunById(id);
+  if (!run) {
+    throw new Error(`Failed to load created chat run ${id}.`);
+  }
+  return run;
+}
+
+export async function getRunById(runId: string): Promise<JobChatRun | null> {
+  const [row] = await db
+    .select()
+    .from(jobChatRuns)
+    .where(eq(jobChatRuns.id, runId));
+  return row ? mapRun(row) : null;
+}
+
+export async function getActiveRunForThread(
+  threadId: string,
+): Promise<JobChatRun | null> {
+  const [row] = await db
+    .select()
+    .from(jobChatRuns)
+    .where(
+      and(
+        eq(jobChatRuns.threadId, threadId),
+        eq(jobChatRuns.status, "running"),
+      ),
+    )
+    .orderBy(desc(jobChatRuns.startedAt))
+    .limit(1);
+
+  return row ? mapRun(row) : null;
+}
+
+export async function completeRun(
+  runId: string,
+  input: {
+    status: Exclude<JobChatRunStatus, "running">;
+    errorCode?: string | null;
+    errorMessage?: string | null;
+  },
+): Promise<JobChatRun | null> {
+  const nowEpoch = Date.now();
+  const nowIso = new Date(nowEpoch).toISOString();
+
+  await db
+    .update(jobChatRuns)
+    .set({
+      status: input.status,
+      completedAt: nowEpoch,
+      errorCode: input.errorCode ?? null,
+      errorMessage: input.errorMessage ?? null,
+      updatedAt: nowIso,
+    })
+    .where(eq(jobChatRuns.id, runId));
+
+  return getRunById(runId);
+}
diff --git a/orchestrator/src/server/repositories/settings.ts b/orchestrator/src/server/repositories/settings.ts
index 40c2774..aacb67b 100644
--- a/orchestrator/src/server/repositories/settings.ts
+++ b/orchestrator/src/server/repositories/settings.ts
@@ -26,6 +26,7 @@ export type SettingKey =
   | "jobspyResultsWanted"
   | "jobspyCountryIndeed"
   | "showSponsorInfo"
+  | "jobChatEnabled"
   | "chatStyleTone"
   | "chatStyleFormality"
   | "chatStyleConstraints"
diff --git a/orchestrator/src/server/services/job-chat-context.ts b/orchestrator/src/server/services/job-chat-context.ts
new file mode 100644
index 0000000..f28616e
--- /dev/null
+++ b/orchestrator/src/server/services/job-chat-context.ts
@@ -0,0 +1,198 @@
+import { logger } from "@infra/logger";
+import { sanitizeUnknown } from "@infra/sanitize";
+import type { Job, ResumeProfile } from "@shared/types";
+import { badRequest, notFound } from "../infra/errors";
+import * as jobsRepo from "../repositories/jobs";
+import * as settingsRepo from "../repositories/settings";
+import { getProfile } from "./profile";
+import { resolveSettingValue } from "./settings-conversion";
+
+type JobChatStyle = {
+  tone: string;
+  formality: string;
+  constraints: string;
+  doNotUse: string;
+};
+
+export type JobChatPromptContext = {
+  job: Job;
+  style: JobChatStyle;
+  systemPrompt: string;
+  jobSnapshot: string;
+  profileSnapshot: string;
+};
+
+const MAX_JOB_DESCRIPTION = 4000;
+const MAX_PROFILE_SUMMARY = 1200;
+const MAX_SKILLS = 18;
+const MAX_PROJECTS = 6;
+const MAX_EXPERIENCE = 5;
+const MAX_ITEM_TEXT = 320;
+
+function truncate(value: string | null | undefined, max: number): string {
+  if (!value) return "";
+  const trimmed = value.trim();
+  if (trimmed.length <= max) return trimmed;
+  return `${trimmed.slice(0, max)}...`;
+}
+
+function compactJoin(parts: Array<string | null | undefined>): string {
+  return parts.filter(Boolean).join("\n");
+}
+
+function buildJobSnapshot(job: Job): string {
+  const snapshot = {
+    event: "job.completed",
+    sentAt: new Date().toISOString(),
+    job: {
+      id: job.id,
+      source: job.source,
+      title: job.title,
+      employer: job.employer,
+      location: job.location,
+      salary: job.salary,
+      status: job.status,
+      jobUrl: job.jobUrl,
+      applicationLink: job.applicationLink,
+      suitabilityScore: job.suitabilityScore,
+      suitabilityReason: truncate(job.suitabilityReason, 600),
+      tailoredSummary: truncate(job.tailoredSummary, 1200),
+      tailoredHeadline: truncate(job.tailoredHeadline, 300),
+      tailoredSkills: truncate(job.tailoredSkills, 1200),
+      jobDescription: truncate(job.jobDescription, MAX_JOB_DESCRIPTION),
+    },
+  };
+
+  return JSON.stringify(snapshot, null, 2);
+}
+
+function buildProfileSnapshot(profile: ResumeProfile): string {
+  const summary =
+    truncate(profile?.sections?.summary?.content, MAX_PROFILE_SUMMARY) ||
+    truncate(profile?.basics?.summary, MAX_PROFILE_SUMMARY);
+
+  const skills = (profile?.sections?.skills?.items ?? [])
+    .slice(0, MAX_SKILLS)
+    .map((item) => {
+      const keywords = (item.keywords ?? []).slice(0, 8).join(", ");
+      return `${item.name}${keywords ? `: ${keywords}` : ""}`;
+    });
+
+  const projects = (profile?.sections?.projects?.items ?? [])
+    .filter((item) => item.visible !== false)
+    .slice(0, MAX_PROJECTS)
+    .map(
+      (item) =>
+        `${item.name} (${item.date || "n/a"}): ${truncate(item.summary, MAX_ITEM_TEXT)}`,
+    );
+
+  const experience = (profile?.sections?.experience?.items ?? [])
+    .filter((item) => item.visible !== false)
+    .slice(0, MAX_EXPERIENCE)
+    .map(
+      (item) =>
+        `${item.position} @ ${item.company} (${item.date || "n/a"}): ${truncate(item.summary, MAX_ITEM_TEXT)}`,
+    );
+
+  return compactJoin([
+    `Name: ${profile?.basics?.name || "Unknown"}`,
+    `Headline: ${truncate(profile?.basics?.headline || profile?.basics?.label, 200) || ""}`,
+    summary ? `Summary:\n${summary}` : null,
+    skills.length > 0 ? `Skills:\n- ${skills.join("\n- ")}` : null,
+    projects.length > 0 ? `Projects:\n- ${projects.join("\n- ")}` : null,
+    experience.length > 0 ? `Experience:\n- ${experience.join("\n- ")}` : null,
+  ]);
+}
+
+function buildSystemPrompt(style: JobChatStyle): string {
+  return compactJoin([
+    "You are a job application copilot for a single job.",
+    "Use only the provided job and profile context unless the user gives extra details.",
+    "Do not claim actions were executed. You are read-only and advisory.",
+    "If details are missing, say what is missing before making assumptions.",
+    "Avoid exposing private profile details that are unrelated to the user request.",
+    `Writing style tone: ${style.tone}.`,
+    `Writing style formality: ${style.formality}.`,
+    style.constraints ? `Writing constraints: ${style.constraints}` : null,
+    style.doNotUse ? `Avoid these terms: ${style.doNotUse}` : null,
+  ]);
+}
+
+async function resolveStyle(): Promise<JobChatStyle> {
+  const overrides = await settingsRepo.getAllSettings();
+  const tone = resolveSettingValue(
+    "chatStyleTone",
+    overrides.chatStyleTone,
+  ).value;
+  const formality = resolveSettingValue(
+    "chatStyleFormality",
+    overrides.chatStyleFormality,
+  ).value;
+  const constraints = resolveSettingValue(
+    "chatStyleConstraints",
+    overrides.chatStyleConstraints,
+  ).value;
+  const doNotUse = resolveSettingValue(
+    "chatStyleDoNotUse",
+    overrides.chatStyleDoNotUse,
+  ).value;
+
+  return {
+    tone,
+    formality,
+    constraints,
+    doNotUse,
+  };
+}
+
+export async function isJobChatEnabled(): Promise<boolean> {
+  const overrides = await settingsRepo.getAllSettings();
+  return resolveSettingValue("jobChatEnabled", overrides.jobChatEnabled).value;
+}
+
+export async function buildJobChatPromptContext(
+  jobId: string,
+): Promise<JobChatPromptContext> {
+  const job = await jobsRepo.getJobById(jobId);
+  if (!job) {
+    throw notFound("Job not found");
+  }
+
+  const style = await resolveStyle();
+
+  let profile: ResumeProfile = {};
+  try {
+    profile = await getProfile();
+  } catch (error) {
+    logger.warn("Failed to load profile for job chat context", {
+      jobId,
+      error: sanitizeUnknown(error),
+    });
+  }
+
+  const systemPrompt = buildSystemPrompt(style);
+  const jobSnapshot = buildJobSnapshot(job);
+  const profileSnapshot = buildProfileSnapshot(profile);
+
+  if (!jobSnapshot.trim()) {
+    throw badRequest("Unable to build job context");
+  }
+
+  logger.info("Built job chat context", {
+    jobId,
+    includesProfile: Boolean(profileSnapshot),
+    contextStats: sanitizeUnknown({
+      systemChars: systemPrompt.length,
+      jobChars: jobSnapshot.length,
+      profileChars: profileSnapshot.length,
+    }),
+  });
+
+  return {
+    job,
+    style,
+    systemPrompt,
+    jobSnapshot,
+    profileSnapshot,
+  };
+}
diff --git a/orchestrator/src/server/services/job-chat.ts b/orchestrator/src/server/services/job-chat.ts
new file mode 100644
index 0000000..12ed81c
--- /dev/null
+++ b/orchestrator/src/server/services/job-chat.ts
@@ -0,0 +1,521 @@
+import { logger } from "@infra/logger";
+import { getRequestId } from "@infra/request-context";
+import {
+  badRequest,
+  conflict,
+  notFound,
+  requestTimeout,
+  upstreamError,
+} from "../infra/errors";
+import * as jobChatRepo from "../repositories/job-chat";
+import * as settingsRepo from "../repositories/settings";
+import {
+  buildJobChatPromptContext,
+  isJobChatEnabled,
+} from "./job-chat-context";
+import { LlmService } from "./llm/service";
+import type { JsonSchemaDefinition } from "./llm/types";
+
+type LlmRuntimeSettings = {
+  model: string;
+  provider: string | null;
+  baseUrl: string | null;
+  apiKey: string | null;
+};
+
+const abortControllers = new Map<string, AbortController>();
+
+const CHAT_RESPONSE_SCHEMA: JsonSchemaDefinition = {
+  name: "job_chat_response",
+  schema: {
+    type: "object",
+    properties: {
+      response: {
+        type: "string",
+      },
+    },
+    required: ["response"],
+    additionalProperties: false,
+  },
+};
+
+function estimateTokenCount(value: string): number {
+  if (!value) return 0;
+  return Math.ceil(value.length / 4);
+}
+
+function chunkText(value: string, maxChunk = 60): string[] {
+  if (!value) return [];
+  const chunks: string[] = [];
+  let cursor = 0;
+  while (cursor < value.length) {
+    chunks.push(value.slice(cursor, cursor + maxChunk));
+    cursor += maxChunk;
+  }
+  return chunks;
+}
+
+async function resolveLlmRuntimeSettings(): Promise<LlmRuntimeSettings> {
+  const overrides = await settingsRepo.getAllSettings();
+
+  const model =
+    overrides.modelTailoring ||
+    overrides.model ||
+    process.env.MODEL ||
+    "google/gemini-3-flash-preview";
+
+  const provider =
+    overrides.llmProvider || process.env.LLM_PROVIDER || "openrouter";
+
+  const baseUrl = overrides.llmBaseUrl || process.env.LLM_BASE_URL || null;
+
+  const apiKey = overrides.llmApiKey || process.env.LLM_API_KEY || null;
+
+  return {
+    model,
+    provider,
+    baseUrl,
+    apiKey,
+  };
+}
+
+async function buildConversationMessages(
+  threadId: string,
+): Promise<Array<{ role: "user" | "assistant"; content: string }>> {
+  const messages = await jobChatRepo.listMessagesForThread(threadId, {
+    limit: 40,
+  });
+
+  return messages
+    .filter(
+      (message): message is typeof message & { role: "user" | "assistant" } =>
+        message.role === "user" || message.role === "assistant",
+    )
+    .filter((message) => message.status !== "failed")
+    .map((message) => ({
+      role: message.role,
+      content: message.content,
+    }));
+}
+
+async function ensureChatEnabled(): Promise<void> {
+  const enabled = await isJobChatEnabled();
+  if (!enabled) {
+    throw badRequest(
+      "Job chat is disabled. Enable it in Settings > Job Chat Copilot.",
+    );
+  }
+}
+
+type GenerateReplyOptions = {
+  jobId: string;
+  threadId: string;
+  prompt: string;
+  replaceMessageId?: string;
+  version?: number;
+  stream?: {
+    onReady: (payload: {
+      runId: string;
+      messageId: string;
+      requestId: string;
+    }) => void;
+    onDelta: (payload: {
+      runId: string;
+      messageId: string;
+      delta: string;
+    }) => void;
+    onCompleted: (payload: {
+      runId: string;
+      message: Awaited<ReturnType<typeof jobChatRepo.getMessageById>>;
+    }) => void;
+    onCancelled: (payload: {
+      runId: string;
+      message: Awaited<ReturnType<typeof jobChatRepo.getMessageById>>;
+    }) => void;
+    onError: (payload: {
+      runId: string;
+      code: string;
+      message: string;
+      requestId: string;
+    }) => void;
+  };
+};
+
+export async function createThread(input: {
+  jobId: string;
+  title?: string | null;
+}) {
+  await ensureChatEnabled();
+  return jobChatRepo.createThread(input);
+}
+
+export async function listThreads(jobId: string) {
+  await ensureChatEnabled();
+  return jobChatRepo.listThreadsForJob(jobId);
+}
+
+export async function listMessages(input: {
+  jobId: string;
+  threadId: string;
+  limit?: number;
+  offset?: number;
+}) {
+  await ensureChatEnabled();
+  const thread = await jobChatRepo.getThreadForJob(input.jobId, input.threadId);
+  if (!thread) {
+    throw notFound("Thread not found for this job");
+  }
+
+  return jobChatRepo.listMessagesForThread(input.threadId, {
+    limit: input.limit,
+    offset: input.offset,
+  });
+}
+
+async function runAssistantReply(
+  options: GenerateReplyOptions,
+): Promise<{ runId: string; messageId: string; message: string }> {
+  await ensureChatEnabled();
+
+  const thread = await jobChatRepo.getThreadForJob(
+    options.jobId,
+    options.threadId,
+  );
+  if (!thread) {
+    throw notFound("Thread not found for this job");
+  }
+
+  const activeRun = await jobChatRepo.getActiveRunForThread(options.threadId);
+  if (activeRun) {
+    throw conflict("A chat generation is already running for this thread");
+  }
+
+  const [context, llmConfig, history] = await Promise.all([
+    buildJobChatPromptContext(options.jobId),
+    resolveLlmRuntimeSettings(),
+    buildConversationMessages(options.threadId),
+  ]);
+
+  const requestId = getRequestId() ?? "unknown";
+
+  const assistantMessage = await jobChatRepo.createMessage({
+    threadId: options.threadId,
+    jobId: options.jobId,
+    role: "assistant",
+    content: "",
+    status: "partial",
+    version: options.version ?? 1,
+    replacesMessageId: options.replaceMessageId ?? null,
+  });
+
+  const run = await jobChatRepo.createRun({
+    threadId: options.threadId,
+    jobId: options.jobId,
+    model: llmConfig.model,
+    provider: llmConfig.provider,
+    requestId,
+  });
+
+  const controller = new AbortController();
+  abortControllers.set(run.id, controller);
+  options.stream?.onReady({
+    runId: run.id,
+    messageId: assistantMessage.id,
+    requestId,
+  });
+
+  let accumulated = "";
+
+  try {
+    const llm = new LlmService({
+      provider: llmConfig.provider,
+      baseUrl: llmConfig.baseUrl,
+      apiKey: llmConfig.apiKey,
+    });
+
+    const llmResult = await llm.callJson<{ response: string }>({
+      model: llmConfig.model,
+      messages: [
+        {
+          role: "system",
+          content: context.systemPrompt,
+        },
+        {
+          role: "system",
+          content: `Job Context (JSON):\n${context.jobSnapshot}`,
+        },
+        {
+          role: "system",
+          content: `Profile Context:\n${context.profileSnapshot || "No profile context available."}`,
+        },
+        ...history,
+        {
+          role: "user",
+          content: options.prompt,
+        },
+      ],
+      jsonSchema: CHAT_RESPONSE_SCHEMA,
+      maxRetries: 1,
+      retryDelayMs: 300,
+      jobId: options.jobId,
+      signal: controller.signal,
+    });
+
+    if (!llmResult.success) {
+      if (controller.signal.aborted) {
+        throw requestTimeout("Chat generation was cancelled");
+      }
+      throw upstreamError("LLM generation failed", {
+        reason: llmResult.error,
+      });
+    }
+
+    const finalText = (llmResult.data.response || "").trim();
+    const chunks = chunkText(finalText);
+
+    for (const chunk of chunks) {
+      if (controller.signal.aborted) {
+        const cancelled = await jobChatRepo.updateMessage(assistantMessage.id, {
+          content: accumulated,
+          status: "cancelled",
+          tokensIn: estimateTokenCount(options.prompt),
+          tokensOut: estimateTokenCount(accumulated),
+        });
+        await jobChatRepo.completeRun(run.id, {
+          status: "cancelled",
+          errorCode: "REQUEST_TIMEOUT",
+          errorMessage: "Generation cancelled by user",
+        });
+        options.stream?.onCancelled({ runId: run.id, message: cancelled });
+        return {
+          runId: run.id,
+          messageId: assistantMessage.id,
+          message: accumulated,
+        };
+      }
+
+      accumulated += chunk;
+      options.stream?.onDelta({
+        runId: run.id,
+        messageId: assistantMessage.id,
+        delta: chunk,
+      });
+    }
+
+    const completedMessage = await jobChatRepo.updateMessage(
+      assistantMessage.id,
+      {
+        content: accumulated,
+        status: "complete",
+        tokensIn: estimateTokenCount(options.prompt),
+        tokensOut: estimateTokenCount(accumulated),
+      },
+    );
+
+    await jobChatRepo.completeRun(run.id, {
+      status: "completed",
+    });
+
+    options.stream?.onCompleted({
+      runId: run.id,
+      message: completedMessage,
+    });
+
+    return {
+      runId: run.id,
+      messageId: assistantMessage.id,
+      message: accumulated,
+    };
+  } catch (error) {
+    const appError = error instanceof Error ? error : new Error(String(error));
+    const isCancelled =
+      controller.signal.aborted || appError.name === "AbortError";
+    const status = isCancelled ? "cancelled" : "failed";
+    const code = isCancelled ? "REQUEST_TIMEOUT" : "UPSTREAM_ERROR";
+    const message = isCancelled
+      ? "Generation cancelled by user"
+      : appError.message || "Generation failed";
+
+    const failedMessage = await jobChatRepo.updateMessage(assistantMessage.id, {
+      content: accumulated,
+      status: isCancelled ? "cancelled" : "failed",
+      tokensIn: estimateTokenCount(options.prompt),
+      tokensOut: estimateTokenCount(accumulated),
+    });
+
+    await jobChatRepo.completeRun(run.id, {
+      status,
+      errorCode: code,
+      errorMessage: message,
+    });
+
+    if (isCancelled) {
+      options.stream?.onCancelled({ runId: run.id, message: failedMessage });
+      return {
+        runId: run.id,
+        messageId: assistantMessage.id,
+        message: accumulated,
+      };
+    }
+
+    options.stream?.onError({
+      runId: run.id,
+      code,
+      message,
+      requestId,
+    });
+
+    throw upstreamError(message, { runId: run.id });
+  } finally {
+    abortControllers.delete(run.id);
+    logger.info("Job chat run finished", {
+      jobId: options.jobId,
+      threadId: options.threadId,
+      runId: run.id,
+    });
+  }
+}
+
+export async function sendMessage(input: {
+  jobId: string;
+  threadId: string;
+  content: string;
+  stream?: GenerateReplyOptions["stream"];
+}) {
+  await ensureChatEnabled();
+
+  const content = input.content.trim();
+  if (!content) {
+    throw badRequest("Message content is required");
+  }
+
+  const thread = await jobChatRepo.getThreadForJob(input.jobId, input.threadId);
+  if (!thread) {
+    throw notFound("Thread not found for this job");
+  }
+
+  const userMessage = await jobChatRepo.createMessage({
+    threadId: input.threadId,
+    jobId: input.jobId,
+    role: "user",
+    content,
+    status: "complete",
+    tokensIn: estimateTokenCount(content),
+    tokensOut: null,
+  });
+
+  const result = await runAssistantReply({
+    jobId: input.jobId,
+    threadId: input.threadId,
+    prompt: content,
+    stream: input.stream,
+  });
+
+  const assistantMessage = await jobChatRepo.getMessageById(result.messageId);
+  return {
+    userMessage,
+    assistantMessage,
+    runId: result.runId,
+  };
+}
+
+export async function regenerateMessage(input: {
+  jobId: string;
+  threadId: string;
+  assistantMessageId: string;
+  stream?: GenerateReplyOptions["stream"];
+}) {
+  await ensureChatEnabled();
+
+  const thread = await jobChatRepo.getThreadForJob(input.jobId, input.threadId);
+  if (!thread) {
+    throw notFound("Thread not found for this job");
+  }
+
+  const target = await jobChatRepo.getMessageById(input.assistantMessageId);
+  if (
+    !target ||
+    target.threadId !== input.threadId ||
+    target.jobId !== input.jobId
+  ) {
+    throw notFound("Assistant message not found for this thread");
+  }
+
+  if (target.role !== "assistant") {
+    throw badRequest("Only assistant messages can be regenerated");
+  }
+
+  const latestAssistant = await jobChatRepo.getLatestAssistantMessage(
+    input.threadId,
+  );
+  if (!latestAssistant || latestAssistant.id !== target.id) {
+    throw badRequest("Only the latest assistant message can be regenerated");
+  }
+
+  const messages = await jobChatRepo.listMessagesForThread(input.threadId, {
+    limit: 200,
+  });
+  const targetIndex = messages.findIndex((message) => message.id === target.id);
+  const priorUser =
+    targetIndex > 0
+      ? [...messages.slice(0, targetIndex)]
+          .reverse()
+          .find((message) => message.role === "user")
+      : null;
+
+  if (!priorUser) {
+    throw badRequest("Could not find a user message to regenerate from");
+  }
+
+  const result = await runAssistantReply({
+    jobId: input.jobId,
+    threadId: input.threadId,
+    prompt: priorUser.content,
+    replaceMessageId: target.id,
+    version: (target.version || 1) + 1,
+    stream: input.stream,
+  });
+
+  const assistantMessage = await jobChatRepo.getMessageById(result.messageId);
+
+  return {
+    runId: result.runId,
+    assistantMessage,
+  };
+}
+
+export async function cancelRun(input: {
+  jobId: string;
+  threadId: string;
+  runId: string;
+}): Promise<{ cancelled: boolean; alreadyFinished: boolean }> {
+  await ensureChatEnabled();
+
+  const run = await jobChatRepo.getRunById(input.runId);
+  if (!run || run.threadId !== input.threadId || run.jobId !== input.jobId) {
+    throw notFound("Run not found for this thread");
+  }
+
+  if (run.status !== "running") {
+    return {
+      cancelled: false,
+      alreadyFinished: true,
+    };
+  }
+
+  const controller = abortControllers.get(input.runId);
+  if (controller) {
+    controller.abort();
+  }
+
+  await jobChatRepo.completeRun(input.runId, {
+    status: "cancelled",
+    errorCode: "REQUEST_TIMEOUT",
+    errorMessage: "Generation cancelled by user",
+  });
+
+  return {
+    cancelled: true,
+    alreadyFinished: false,
+  };
+}
diff --git a/orchestrator/src/server/services/settings-conversion.ts b/orchestrator/src/server/services/settings-conversion.ts
index b8df62a..cee5cda 100644
--- a/orchestrator/src/server/services/settings-conversion.ts
+++ b/orchestrator/src/server/services/settings-conversion.ts
@@ -13,6 +13,7 @@ type SettingsConversionValueMap = {
   jobspyResultsWanted: number;
   jobspyCountryIndeed: string;
   showSponsorInfo: boolean;
+  jobChatEnabled: boolean;
   chatStyleTone: string;
   chatStyleFormality: string;
   chatStyleConstraints: string;
@@ -141,6 +142,14 @@ export const settingsConversionMetadata: SettingsConversionMetadata = {
     serialize: serializeBitBool,
     resolve: resolveWithNullishFallback,
   },
+  jobChatEnabled: {
+    defaultValue: () =>
+      (process.env.JOB_CHAT_ENABLED || "").toLowerCase() === "true" ||
+      process.env.JOB_CHAT_ENABLED === "1",
+    parseOverride: parseBitBoolOrNull,
+    serialize: serializeBitBool,
+    resolve: resolveWithNullishFallback,
+  },
   chatStyleTone: {
     defaultValue: () => process.env.CHAT_STYLE_TONE || "professional",
     parseOverride: (raw) => raw ?? null,
diff --git a/orchestrator/src/server/services/settings-update/registry.ts b/orchestrator/src/server/services/settings-update/registry.ts
index 1d0d630..93c21d0 100644
--- a/orchestrator/src/server/services/settings-update/registry.ts
+++ b/orchestrator/src/server/services/settings-update/registry.ts
@@ -188,6 +188,11 @@ export const settingsUpdateRegistry: Partial<{
       actions: [metadataPersistAction("showSponsorInfo", value)],
     }),
   ),
+  jobChatEnabled: singleAction(({ value }) =>
+    result({
+      actions: [metadataPersistAction("jobChatEnabled", value)],
+    }),
+  ),
   chatStyleTone: singleAction(({ value }) =>
     result({
       actions: [metadataPersistAction("chatStyleTone", value)],
diff --git a/orchestrator/src/server/services/settings.ts b/orchestrator/src/server/services/settings.ts
index 71425af..9778f18 100644
--- a/orchestrator/src/server/services/settings.ts
+++ b/orchestrator/src/server/services/settings.ts
@@ -146,6 +146,14 @@ export async function getEffectiveSettings(): Promise<AppSettings> {
   const overrideShowSponsorInfo = showSponsorInfoSetting.overrideValue;
   const showSponsorInfo = showSponsorInfoSetting.value;
 
+  const jobChatEnabledSetting = resolveSettingValue(
+    "jobChatEnabled",
+    overrides.jobChatEnabled,
+  );
+  const defaultJobChatEnabled = jobChatEnabledSetting.defaultValue;
+  const overrideJobChatEnabled = jobChatEnabledSetting.overrideValue;
+  const jobChatEnabled = jobChatEnabledSetting.value;
+
   const chatStyleToneSetting = resolveSettingValue(
     "chatStyleTone",
     overrides.chatStyleTone,
@@ -278,6 +286,9 @@ export async function getEffectiveSettings(): Promise<AppSettings> {
     showSponsorInfo,
     defaultShowSponsorInfo,
     overrideShowSponsorInfo,
+    jobChatEnabled,
+    defaultJobChatEnabled,
+    overrideJobChatEnabled,
     chatStyleTone,
     defaultChatStyleTone,
     overrideChatStyleTone,
diff --git a/shared/src/settings-schema.ts b/shared/src/settings-schema.ts
index 07f4280..c6352f2 100644
--- a/shared/src/settings-schema.ts
+++ b/shared/src/settings-schema.ts
@@ -54,6 +54,7 @@ export const updateSettingsSchema = z
       .optional(),
     jobspyCountryIndeed: z.string().trim().max(100).nullable().optional(),
     showSponsorInfo: z.boolean().nullable().optional(),
+    jobChatEnabled: z.boolean().nullable().optional(),
     chatStyleTone: z.string().trim().max(100).nullable().optional(),
     chatStyleFormality: z.string().trim().max(100).nullable().optional(),
     chatStyleConstraints: z.string().trim().max(4000).nullable().optional(),
diff --git a/shared/src/testing/factories.ts b/shared/src/testing/factories.ts
index 2b2a087..f5ab03c 100644
--- a/shared/src/testing/factories.ts
+++ b/shared/src/testing/factories.ts
@@ -179,6 +179,9 @@ export const createAppSettings = (
   showSponsorInfo: true,
   defaultShowSponsorInfo: true,
   overrideShowSponsorInfo: null,
+  jobChatEnabled: false,
+  defaultJobChatEnabled: false,
+  overrideJobChatEnabled: null,
   chatStyleTone: "professional",
   defaultChatStyleTone: "professional",
   overrideChatStyleTone: null,
diff --git a/shared/src/types.ts b/shared/src/types.ts
index f220f74..512eeda 100644
--- a/shared/src/types.ts
+++ b/shared/src/types.ts
@@ -913,6 +913,9 @@ export interface AppSettings {
   showSponsorInfo: boolean;
   defaultShowSponsorInfo: boolean;
   overrideShowSponsorInfo: boolean | null;
+  jobChatEnabled: boolean;
+  defaultJobChatEnabled: boolean;
+  overrideJobChatEnabled: boolean | null;
   chatStyleTone: string;
   defaultChatStyleTone: string;
   overrideChatStyleTone: string | null;