diff --git a/orchestrator/src/server/services/ai-resilience.test.ts b/orchestrator/src/server/services/ai-resilience.test.ts
new file mode 100644
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+++ b/orchestrator/src/server/services/ai-resilience.test.ts
@@ -0,0 +1,192 @@
+
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+import { scoreJobSuitability } from './scorer.js';
+import { pickProjectIdsForJob } from './projectSelection.js';
+import type { Job } from '../../shared/types.js';
+
+// --- Mocks ---
+// We need to mock 'fetch' globally for these tests
+const globalFetch = global.fetch;
+
+// A simple mock job
+const mockJob: Job = {
+    id: 'test-job',
+    employer: 'Test Corp',
+    title: 'Senior Engineer',
+    jobDescription: 'Looking for a TypeScript and React expert.',
+    url: 'http://test.com',
+    date: '2023-01-01',
+    source: 'test' as any,
+    status: 'discovered'
+};
+
+const mockProfile = { name: 'Test User' };
+
+describe('AI Service Resilience', () => {
+
+    beforeEach(() => {
+        global.fetch = vi.fn();
+        process.env.OPENROUTER_API_KEY = 'mock-key'; // Ensure logic tries to call API
+    });
+
+    afterEach(() => {
+        global.fetch = globalFetch;
+        delete process.env.OPENROUTER_API_KEY;
+        vi.restoreAllMocks();
+    });
+
+    describe('scoreJobSuitability (Scorer)', () => {
+
+        it('should return parsed score when API returns valid JSON', async () => {
+            const mockResponse = {
+                ok: true,
+                json: async () => ({
+                    choices: [{ message: { content: JSON.stringify({ score: 85, reason: 'Great match' }) } }]
+                })
+            };
+            vi.mocked(global.fetch).mockResolvedValue(mockResponse as any);
+
+            const result = await scoreJobSuitability(mockJob, mockProfile);
+
+            expect(result.score).toBe(85);
+            expect(result.reason).toBe('Great match');
+        });
+
+        it('should fallback to mock scoring if API Key is missing', async () => {
+            delete process.env.OPENROUTER_API_KEY;
+            
+            // Should NOT call fetch
+            const result = await scoreJobSuitability(mockJob, mockProfile);
+            
+            expect(global.fetch).not.toHaveBeenCalled();
+            // Mock score logic gives 50 + points for keywords. 
+            // 'TypeScript' and 'React' are in JD (5+5) -> 60?
+            // "Senior" is bad keyword (-10)? -> 50?
+             // Let's just check it didn't crash and returned a number
+            expect(typeof result.score).toBe('number');
+            expect(result.reason).toContain('keyword matching');
+        });
+
+        it('should handle API 500/400 errors gracefully (fallback)', async () => {
+            vi.mocked(global.fetch).mockResolvedValue({
+                ok: false,
+                status: 500,
+                statusText: 'Internal Server Error'
+            } as any);
+
+            // Spy on console.error to keep test output clean
+            const consoleSpy = vi.spyOn(console, 'error').mockImplementation(() => {});
+
+            const result = await scoreJobSuitability(mockJob, mockProfile);
+
+            expect(result.score).toBeDefined(); // Fallback score
+            expect(result.reason).toContain('keyword matching'); // Fallback reason
+            expect(consoleSpy).toHaveBeenCalled();
+        });
+
+        it('should handle Malformed/Invalid JSON in API response', async () => {
+             const mockResponse = {
+                ok: true,
+                json: async () => ({
+                    choices: [{ message: { content: 'This is not JSON at all, just text.' } }]
+                })
+            };
+            vi.mocked(global.fetch).mockResolvedValue(mockResponse as any);
+            const consoleSpy = vi.spyOn(console, 'error').mockImplementation(() => {});
+
+            const result = await scoreJobSuitability(mockJob, mockProfile);
+            
+            expect(result.reason).toContain('keyword matching'); // Fell back
+        });
+
+        it('should extract JSON from markdown code blocks', async () => {
+             const mockResponse = {
+                ok: true,
+                json: async () => ({
+                    choices: [{ message: { content: 'Here is the score: ```json\n{ "score": 90, "reason": "Good" }\n```' } }]
+                })
+            };
+            vi.mocked(global.fetch).mockResolvedValue(mockResponse as any);
+
+            const result = await scoreJobSuitability(mockJob, mockProfile);
+            expect(result.score).toBe(90);
+        });
+    });
+
+    describe('pickProjectIdsForJob (Project Selection)', () => {
+        const mockProjects = [
+            { id: 'p1', name: 'React App', description: 'Used React', date: '2022', summaryText: 'React stuff', isVisibleInBase: true },
+            { id: 'p2', name: 'Python Script', description: 'Used Python', date: '2023', summaryText: 'Python stuff', isVisibleInBase: true }
+        ];
+
+        it('should return projects selected by AI', async () => {
+             const mockResponse = {
+                ok: true,
+                json: async () => ({
+                    choices: [{ message: { content: JSON.stringify({ selectedProjectIds: ['p1'] }) } }]
+                })
+            };
+            vi.mocked(global.fetch).mockResolvedValue(mockResponse as any);
+
+            const result = await pickProjectIdsForJob({
+                jobDescription: 'React dev',
+                eligibleProjects: mockProjects,
+                desiredCount: 1
+            });
+
+            expect(result).toEqual(['p1']);
+        });
+
+        it('should fallback if API fails', async () => {
+             vi.mocked(global.fetch).mockRejectedValue(new Error('Network error'));
+
+             const result = await pickProjectIdsForJob({
+                jobDescription: 'React dev', // Should match p1 due to keyword 'React'
+                eligibleProjects: mockProjects,
+                desiredCount: 1
+            });
+
+            // It should fall back to keyword matching
+            // p1 has 'React', p2 has 'Python'. 'React dev' matches p1.
+            expect(result).toEqual(['p1']);
+        });
+
+        it('should fallback if AI returns garbage', async () => {
+            const mockResponse = {
+                ok: true,
+                json: async () => ({
+                    choices: [{ message: { content: 'No valid JSON here' } }]
+                })
+            };
+            vi.mocked(global.fetch).mockResolvedValue(mockResponse as any);
+
+            const result = await pickProjectIdsForJob({
+                jobDescription: 'Python dev', // Should match p2
+                eligibleProjects: mockProjects,
+                desiredCount: 1
+            });
+
+            expect(result).toEqual(['p2']);
+        });
+
+         it('should validate returned IDs exist in eligible list', async () => {
+            // AI returns an ID that doesn't exist ('p999')
+            const mockResponse = {
+                ok: true,
+                json: async () => ({
+                     choices: [{ message: { content: JSON.stringify({ selectedProjectIds: ['p999', 'p1'] }) } }]
+                })
+            };
+            vi.mocked(global.fetch).mockResolvedValue(mockResponse as any);
+
+            const result = await pickProjectIdsForJob({
+                jobDescription: 'stuff', 
+                eligibleProjects: mockProjects,
+                desiredCount: 2
+            });
+
+            // Should strip p999 and only return p1
+            expect(result).toEqual(['p1']);
+        });
+    });
+});