diff --git a/apps/backend/src/app/api/deployments/[id]/route.test.ts b/apps/backend/src/app/api/deployments/[id]/route.test.ts
index 20ee59d..4c91ca6 100644
--- a/apps/backend/src/app/api/deployments/[id]/route.test.ts
+++ b/apps/backend/src/app/api/deployments/[id]/route.test.ts
@@ -25,6 +25,12 @@
 
 import { describe, it, expect, vi, beforeEach } from 'vitest';
 import { NextRequest } from 'next/server';
+import { DELETE } from './route';
+import { DeploymentService } from '@/services/deployment.service';
+import { RepositoryCleanupService } from '@/services/github/repository-cleanup.service';
+
+// Mock the external service
+jest.mock('@/services/github/repository-cleanup.service');
 
 // ---------------------------------------------------------------------------
 // Supabase mock
@@ -315,6 +321,62 @@ describe('GET /api/deployments/[id]', () => {
 // ---------------------------------------------------------------------------
 
 describe('DELETE /api/deployments/[id]', () => {
+  beforeEach(() => {
+    jest.clearAllMocks();
+  });
+
+  it('should call cleanup(github_repo_id) after DB row is soft-deleted', async () => {
+    // Arrange
+    const mockDeployment = { id: 'dep-123', github_repo_id: 'repo-456' };
+    jest.spyOn(DeploymentService, 'findById').mockResolvedValue(mockDeployment as any);
+    const softDeleteSpy = jest.spyOn(DeploymentService, 'softDelete').mockResolvedValue(true);
+    
+    // Act
+    const response = await DELETE({} as Request, { params: { id: 'dep-123' } });
+    
+    // Assert
+    expect(softDeleteSpy).toHaveBeenCalledWith('dep-123');
+    expect(RepositoryCleanupService.cleanup).toHaveBeenCalledWith('repo-456');
+    expect(response.status).toBe(200);
+  });
+
+  it('should treat GitHub cleanup failures as non-fatal and still return 200', async () => {
+    // Arrange
+    const mockDeployment = { id: 'dep-123', github_repo_id: 'repo-456' };
+    jest.spyOn(DeploymentService, 'findById').mockResolvedValue(mockDeployment as any);
+    jest.spyOn(DeploymentService, 'softDelete').mockResolvedValue(true);
+    
+    // Simulate GitHub API failure
+    (RepositoryCleanupService.cleanup as jest.Mock).mockRejectedValue(new Error('GitHub API Rate Limit'));
+    const consoleErrorSpy = jest.spyOn(console, 'error').mockImplementation();
+
+    // Act
+    const response = await DELETE({} as Request, { params: { id: 'dep-123' } });
+    
+    // Assert
+    expect(RepositoryCleanupService.cleanup).toHaveBeenCalledWith('repo-456');
+    expect(consoleErrorSpy).toHaveBeenCalledWith(
+      expect.stringContaining('[Non-Fatal] Failed to cleanup GitHub repo'),
+      expect.any(Error)
+    );
+    expect(response.status).toBe(200); // Verify DB record delete completes despite external error
+  });
+
+  it('should skip cleanup if github_repo_id is null', async () => {
+    // Arrange
+    const mockDeployment = { id: 'dep-123', github_repo_id: null };
+    jest.spyOn(DeploymentService, 'findById').mockResolvedValue(mockDeployment as any);
+    jest.spyOn(DeploymentService, 'softDelete').mockResolvedValue(true);
+    
+    // Act
+    const response = await DELETE({} as Request, { params: { id: 'dep-123' } });
+    
+    // Assert
+    expect(RepositoryCleanupService.cleanup).not.toHaveBeenCalled();
+    expect(response.status).toBe(200);
+  });
+
+    
     beforeEach(() => {
         vi.clearAllMocks();
         mockGetUser.mockResolvedValue({ data: { user: fakeUser }, error: null });
diff --git a/apps/backend/src/app/api/deployments/[id]/route.ts b/apps/backend/src/app/api/deployments/[id]/route.ts
index c64aacc..a4710df 100644
--- a/apps/backend/src/app/api/deployments/[id]/route.ts
+++ b/apps/backend/src/app/api/deployments/[id]/route.ts
@@ -58,6 +58,10 @@ import { NextRequest, NextResponse } from 'next/server';
 import { withAuth } from '@/lib/api/with-auth';
 import { githubService } from '@/services/github.service';
 import { vercelService } from '@/services/vercel.service';
+import { DeploymentService } from '@/services/deployment.service';
+import { RepositoryCleanupService } from '@/services/github/repository-cleanup.service'; // Adjust import path as needed
+
+
 
 export const GET = withAuth(async (req: NextRequest, { params, user, supabase }) => {
     const deploymentId = (params as { id: string }).id;
@@ -166,4 +170,39 @@ export const DELETE = withAuth(async (req: NextRequest, { params, user, supabase
         success: true,
         deploymentId,
     });
+
+  export async function DELETE(
+  request: Request,
+  { params }: { params: { id: string } }) 
+  {
+      try {
+        const deploymentId = params.id;
+
+    // 1. Fetch the deployment to get the github_repo_id before deleting
+    const deployment = await DeploymentService.findById(deploymentId);
+    
+    if (!deployment) {
+      return NextResponse.json({ error: 'Deployment not found' }, { status: 404 });
+    }
+
+    // 2. Soft-delete the DB row
+    await DeploymentService.softDelete(deploymentId);
+
+    // 3. Trigger GitHub Repo Cleanup (Non-fatal)
+    if (deployment.github_repo_id) {
+      try {
+        // Run cleanup asynchronously or await it, but catch errors locally
+        await RepositoryCleanupService.cleanup(deployment.github_repo_id);
+      } catch (githubError) {
+        // Acceptance Criteria: Treat GitHub API errors as non-fatal — log and continue
+        console.error(`[Non-Fatal] Failed to cleanup GitHub repo ${deployment.github_repo_id} for deployment ${deploymentId}:`, githubError);
+      }
+    }
+
+    return NextResponse.json({ success: true, message: 'Deployment deleted' });
+  } catch (error) {
+    console.error('Failed to delete deployment:', error);
+    return NextResponse.json({ error: 'Internal Server Error' }, { status: 500 });
+      }
+
 });