Frontend Developer Interview Guide

Frontend Interview Guide: React, Performance, and Accessibility

Frontend interviews test JavaScript fundamentals, framework expertise (React, Vue, Angular), CSS layout, performance optimization, and accessibility. According to the 2025 State of JS Survey, React maintains 82% usage among professional developers, making it the de facto standard tested in interviews.

The three areas frontend interviews test: JavaScript fundamentals (closures, event loop, promises), React patterns (hooks, state management, rendering optimization), and web platform (DOM API, CSS, accessibility, performance).

Core Frontend Topics

• JavaScript — Closures, prototypes, event loop, async/await, ES6+ features
• React — Hooks (useState, useEffect, useMemo, useCallback), context, error boundaries. See React interview questions
• CSS — Flexbox, Grid, responsive design, CSS-in-JS, specificity
• Performance — Core Web Vitals (LCP, FID, CLS), code splitting, lazy loading
• Accessibility — ARIA roles, semantic HTML, keyboard navigation, screen reader testing

Related: full-stack tips, React questions. Practice with AissenceAI coding copilot.