Question 1

What are the most common frontend interview questions?

Accepted Answer

The most common frontend interview questions cover JavaScript fundamentals (event loop, closures, async/await, prototypes), React (hooks like useState/useEffect/useMemo, reconciliation, performance optimization), CSS and layout (flexbox, grid, specificity), frontend system design (autocomplete, infinite scroll, design a YouTube player), and behavioral questions.

Question 2

What is a machine coding round in a frontend interview?

Accepted Answer

A machine coding round is a live coding session where you build a functional UI component or mini-application from scratch — for example, an autocomplete search, a Kanban board, a star rating widget, or an infinite scroll list. It tests your ability to write clean, maintainable code under time pressure. Machine coding rounds are common at Indian tech companies like Flipkart, Swiggy, Razorpay, and CRED.

Question 3

How do I prepare for React interview questions?

Accepted Answer

To prepare for React interview questions, focus on: (1) React hooks — useState, useEffect, useCallback, useMemo, useRef, and custom hooks; (2) Reconciliation and the virtual DOM; (3) Performance optimization — React.memo, lazy loading, code splitting; (4) State management patterns — Context API, Redux, Zustand; (5) Component design patterns. Practice by building components from scratch and getting AI feedback on your code.

Question 4

What frontend interview questions are asked for 3+ years of experience?

Accepted Answer

For engineers with 3+ years of experience, interviewers expect depth in React architecture, performance optimization, TypeScript, frontend system design (designing scalable component libraries, state machines, API layers), and behavioral questions about owning features end-to-end. Machine coding rounds will expect production-quality code with error handling and edge cases.

Frontend Interview Questions

JavaScript & TypeScript

React

Frontend System Design

Behavioral

How answer evaluation works

AI-powered scoring

Targeted prep modules

Interview-realistic format

Practice with real-time AI feedback