Technical interview questions and drills

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Showing the React & Next.js Practical UI Labs curriculum. Technology tags describe each drill's actual implementation context; shared drills can belong to more than one track.

Coding problemEasy~15 min

Build an accessible profile form

Implements labeled fields, client validation, error summaries, focus recovery, and pending submission state.

In React & Next.js Practical UI LabsShared across 3 tracks

Next.jsReactTypeScript

Drills

Build an accessible profile form

Build a recoverable route error boundary

Build upload progress and retry recovery

Debounce search and discard stale responses

Fix a time-based hydration mismatch

Implement an optimistic favorite with rollback

Map API field errors into a form

Prevent a duplicate form mutation

Reduce expensive list rerenders deliberately

Render capability-aware UI without trusting it

Render complete data-page states

Split a Next.js page at the interaction boundary

Synchronize filters and pagination with the URL

Test a component through user behavior

Test a critical user flow with Playwright