35 React Interview Questions Senior Developers Still Get Wrong
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A comprehensive guide to modern React interview questions covering rendering behavior, hooks (useState, useRef, useEffect, useLayoutEffect), React 19 features (Actions, useOptimistic, React Compiler), Server Components, performance optimization, state management patterns, React Router, and testing. Each question includes practical code examples and explains the reasoning behind correct answers, with emphasis on understanding React internals rather than memorizing APIs.
Table of contents
Understanding How React Actually RendersKeys: The Question That Appears EverywhereModern React Hooks QuestionsReact 19 Interview QuestionsPerformance QuestionsState Management QuestionsReact Router QuestionsTesting QuestionsSenior-Level Architecture QuestionsFinal Thoughts105.2K Impressions6 Comments