Production Readiness Interview Questions for React Developers
Production readiness comes up in interviews, especially for mid-level roles. Here are the common questions.
Production Readiness Interview Questions for React Developers
Production readiness comes up in interviews, especially for mid-level and senior roles. Here are the common questions.
How do you deploy a React app?
Run npm run build, deploy the build folder to a host like Vercel, set environment variables in the dashboard, and configure SPA routing so deep links work.
What is the difference between dev and production builds?
Dev builds keep readable code, source maps, and hot reload. Production builds minify code, remove development warnings, and optimize for size and speed.
How do you handle environment variables in production?
Set them in the hosting dashboard, not in code. Remember frontend env vars are visible to users, so real secrets go in a backend, not in React.
Why do React routes break after deployment?
Because the host serves 404 for routes that are not files. Fix by redirecting all routes to index.html so React Router handles them.
What do you check before shipping to production?
Production build succeeds, bundle size, env vars, error boundaries, loading and error states, auth in production, responsiveness, accessibility, and testing the deployed app.
How to Answer Well
Frame answers around the gap between dev and production. Interviewers want to hear that you treat production as its own environment with its own concerns, not just 'run the build and hope.'
The Takeaway
Know how to deploy, dev vs production builds, handling env vars, why routes break and the fix, and what to check before shipping. Frame answers around the gap between dev and production, which shows real engineering maturity.
Run npm run build, deploy the build folder to a host like Vercel, Netlify, or Firebase Hosting, set environment variables in the dashboard, and configure SPA routing so deep links work.
Set them in the hosting dashboard, not in code. Remember that frontend env vars are visible to users in the browser, so real secrets go in a backend, not in React code.
Because the host serves 404 for routes that are not files. Fix by redirecting all routes to index.html, so React Router loads and handles the route client-side.
Production build succeeds, bundle size is reasonable, env vars are set, error boundaries wrap the app, loading and error states are everywhere, auth works in production, and the app is responsive and accessible.
Dev builds keep readable code, source maps, and hot reload. Production builds minify code, remove development warnings, and optimize for size and speed, so users load less and faster.
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