React Interview Questions & Assessment
Assess React expertise including hooks, state management, component patterns, performance optimization, and the React ecosystem.
Why React Matters
React is the most popular frontend framework, used by Meta, Netflix, Airbnb, and thousands of startups. React developers are consistently the most sought-after frontend engineers.
Sample Interview Questions
Explain the difference between useEffect and useLayoutEffect. When would you use each?
How does React's reconciliation algorithm work? What is the Virtual DOM?
Design a custom hook for managing form state with validation.
What causes unnecessary re-renders? Describe three strategies to prevent them.
Explain controlled vs uncontrolled components. When would you choose each?
How to Prepare
Master all built-in hooks: useState, useEffect, useRef, useMemo, useCallback
Understand React's rendering lifecycle and when components re-render
Practice building custom hooks for reusable logic
Know state management patterns: Context, Redux, Zustand
Be familiar with React Server Components and the latest React features
Related Skills
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