diff --git a/packages/api/src/__tests__/bounties_list.test.ts b/packages/api/src/__tests__/bounties_list.test.ts
index 7030900..cac4126 100644
--- a/packages/api/src/__tests__/bounties_list.test.ts
+++ b/packages/api/src/__tests__/bounties_list.test.ts
@@ -14,8 +14,13 @@ vi.mock('../db', () => ({
         query: {
             bounties: {
                 findMany: vi.fn(),
+                findFirst: vi.fn(),
+            },
+            users: {
+                findFirst: vi.fn(),
             },
         },
+        select: vi.fn(),
     },
 }));
 
@@ -161,4 +166,99 @@ describe('GET /api/bounties', () => {
         const body = await res.json();
         expect(body.error).toBe('Invalid cursor');
     });
+
+    it('should return detailed bounty information for GET /api/bounties/:id', async () => {
+        const bountyId = 'bounty-1';
+        vi.mocked(db.query.bounties.findFirst).mockResolvedValue({
+            id: bountyId,
+            title: 'Bounty 1',
+            status: 'open',
+            creatorId: 'creator-1',
+            assigneeId: 'assignee-1',
+        } as any);
+
+        vi.mocked(db.query.users.findFirst)
+            .mockResolvedValueOnce({ username: 'creatorUser', avatarUrl: 'https://avatar/creator.png' } as any)
+            .mockResolvedValueOnce({ username: 'assigneeUser', avatarUrl: 'https://avatar/assignee.png' } as any);
+
+        vi.mocked(db.select as any).mockReturnValue({
+            from: () => ({
+                where: async () => [{ count: 3 }],
+            }),
+        } as any);
+
+        const res = await app.request(`/api/bounties/${bountyId}`, {
+            headers: {
+                'Authorization': 'Bearer valid.token'
+            }
+        });
+
+        expect(res.status).toBe(200);
+        const body = await res.json();
+
+        expect(body.id).toBe(bountyId);
+        expect(body.creator).toEqual({
+            username: 'creatorUser',
+            avatar: 'https://avatar/creator.png',
+        });
+        expect(body.assignee).toEqual({
+            username: 'assigneeUser',
+            avatar: 'https://avatar/assignee.png',
+        });
+        expect(body.applicationCount).toBe(3);
+    });
+
+
+    it('should return null assignee when bounty has no assignee for GET /api/bounties/:id', async () => {
+        const bountyId = 'bounty-no-assignee';
+
+        vi.mocked(db.query.bounties.findFirst).mockResolvedValue({
+            id: bountyId,
+            title: 'Bounty 2',
+            status: 'open',
+            creatorId: 'creator-1',
+            assigneeId: null,
+        } as any);
+
+        vi.mocked(db.query.users.findFirst)
+            .mockResolvedValueOnce({ username: 'creatorUser', avatarUrl: 'https://avatar/creator.png' } as any);
+
+        vi.mocked(db.select as any).mockReturnValue({
+            from: () => ({
+                where: async () => [{ count: 1 }],
+            }),
+        } as any);
+
+        const res = await app.request(`/api/bounties/${bountyId}`, {
+            headers: {
+                'Authorization': 'Bearer valid.token'
+            }
+        });
+
+        expect(res.status).toBe(200);
+        const body = await res.json();
+
+        expect(body.id).toBe(bountyId);
+        expect(body.creator).toEqual({
+            username: 'creatorUser',
+            avatar: 'https://avatar/creator.png',
+        });
+        expect(body.assignee).toBeNull();
+        expect(body.applicationCount).toBe(1);
+    });
+
+    it('should return 404 when bounty is not found for GET /api/bounties/:id', async () => {
+        vi.mocked(db.query.bounties.findFirst).mockResolvedValue(null as any);
+
+        const res = await app.request('/api/bounties/non-existent', {
+            headers: {
+                'Authorization': 'Bearer valid.token'
+            }
+        });
+
+        expect(res.status).toBe(404);
+        const body = await res.json();
+        expect(body.error).toBe('Bounty not found');
+    });
+
 });
diff --git a/packages/api/src/routes/bounties.ts b/packages/api/src/routes/bounties.ts
index 2f4f6e6..da6809c 100644
--- a/packages/api/src/routes/bounties.ts
+++ b/packages/api/src/routes/bounties.ts
@@ -2,7 +2,7 @@ import { Hono } from 'hono';
 import { Variables } from '../middleware/auth';
 import { ensureBountyCreator, ensureBountyAssignee } from '../middleware/resource-auth';
 import { db } from '../db';
-import { bounties } from '../db/schema';
+import { bounties, users, applications } from '../db/schema';
 import { eq, and, gte, lte, sql, desc, or, lt } from 'drizzle-orm';
 
 const bountiesRouter = new Hono<{ Variables: Variables }>();
@@ -136,7 +136,45 @@ bountiesRouter.get('/:id', async (c) => {
         return c.json({ error: 'Bounty not found' }, 404);
     }
 
-    return c.json(bounty);
+    const [creator, assignee, applicationCount] = await Promise.all([
+        db.query.users.findFirst({
+            where: eq(users.id, bounty.creatorId),
+            columns: {
+                username: true,
+                avatarUrl: true,
+            },
+        }),
+        bounty.assigneeId
+            ? db.query.users.findFirst({
+                where: eq(users.id, bounty.assigneeId),
+                columns: {
+                    username: true,
+                    avatarUrl: true,
+                },
+            })
+            : Promise.resolve(null),
+        db
+            .select({ count: sql<number>`count(*)` })
+            .from(applications)
+            .where(eq(applications.bountyId, id)),
+    ]);
+
+    return c.json({
+        ...bounty,
+        creator: creator
+            ? {
+                username: creator.username,
+                avatar: creator.avatarUrl,
+            }
+            : null,
+        assignee: assignee
+            ? {
+                username: assignee.username,
+                avatar: assignee.avatarUrl,
+            }
+            : null,
+        applicationCount: Number(applicationCount[0]?.count ?? 0),
+    });
 });
 
 /**