IntermediateSITUATIONAL
You’ve just joined a project where the frontend is a React SPA and the backend is an Express/Node API. The team is complaining about frequent CORS issues, mismatched API contracts, and flaky integration between the two. Describe the concrete steps you’d take in your first week to diagnose and stabilize the integration.
Full Stack Developer
General

Sample Answer

Situation: On a React/Node project, the team faced daily CORS errors, 4xx spikes, and fragile frontend–backend integration. Task: In week one, I needed to stabilize contracts and unblock delivery. Action: I started by enabling detailed CORS and request logging in Express (morgan/winston) and capturing failing calls in the browser Network tab and Sentry. Then I introduced an OpenAPI/Swagger spec as the single source of truth and auto-generated a typed API client for React (Typescript). I added contract tests (Jest + supertest) that validated responses against the spec in CI and set up a shared .env config for consistent base URLs and CORS origins. Result: We eliminated CORS errors in 2 days, reduced integration bugs by ~70% in the first sprint, and cut QA-reported contract issues to near zero.

Keywords

Introduce OpenAPI/Swagger as single source of truth for contractsCentralize CORS configuration and environment-based originsAdd contract and integration tests (Jest, supertest) in CIUse logging/monitoring (Network tab, Sentry, winston) to trace failures
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