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React Interview Prep

React Interview Preparation Track​

Use this React track to get interview-ready fast. Each level focuses on topics hiring teams probe most often.

Level 1 — Fundamentals & Core Concepts​

  • Core definitions & understanding (Library vs Framework, JSX, Virtual DOM)
  • Components (functional vs class)
  • Hooks (useState, useEffect, basic hooks)
  • Component lifecycle (mount, update, unmount)
  • State
  • Props
  • Rendering fundamentals (re-rendering, keys, conditional rendering)

Level 2 — Application Patterns & Day-to-Day Development​

  • Component communication patterns
  • Controlled vs uncontrolled components
  • Forms & validation
  • Data fetching (REST, async/await, loading & error states)
  • Side-effects management
  • State management patterns (lifting state, context)
  • Routing concepts
  • Debugging workflows (React DevTools, console, common bugs)
  • Error handling & error boundaries

Level 3 — Architecture, Performance & Scaling​

  • Application architecture patterns
  • State management at scale (Redux, Context trade-offs)
  • Performance optimization
    • memo, useMemo, useCallback
    • avoiding unnecessary re-renders
  • Code splitting & lazy loading
  • Rendering performance (virtualization, pagination)
  • Reusability & component design patterns
  • Testing fundamentals (unit vs integration)
  • Scalability & maintainability trade-offs
  • Build & deployment considerations