Role

React Developer

Real interview questions with expert answers, plain-English explanations, and practical examples. (4 questions)

Intuit React Developer React

How do React’s memoization features (e.g., `React.memo`, `useMemo`, `useCallback`) improve performance, and when should a React Developer use each?

Read answer →
Mphasis React Developer React

How does React’s component lifecycle enable efficient state and side effect management in a complex application, and when would you use `useEffect` for data fetching versus `useLayoutEffect`?

Read answer →
Cognizant React Developer Performance Optimization

How would a Senior React Developer diagnose and resolve performance bottlenecks in a complex Cognizant web application, and what advanced optimization techniques would they employ?

Read answer →
Cognizant React Developer React

What’s the difference between useMemo and useCallback, and when does each actually matter for performance?

Read answer →