React Frontend interview practice

React-specific depth: rendering behavior, hooks semantics, performance, and modern patterns — the specialist screen many companies run.

Topics this interview probes

Reconciliation & rendering Hooks semantics Memoization strategy Server components Form & data fetching Testing philosophy

Explain why a state update inside useEffect can cause an extra render, and how you’d fix the pattern.
When does memo actually help, and when is it cargo-culting? Give me a concrete rule of thumb.
How do server components change your data-fetching architecture versus a classic SPA?

The live interviewer generates fresh, role-tailored questions — and drills down when your answers are vague.