My Cars24 Frontend Engineer Interview Experience (2025)

Overview

This article details a Frontend Engineer interview experience at Cars24 for the Software Development Engineer 3 position. Cars24 is an Indian multinational online used car marketplace headquartered in Gurgaon, recognized as one of the four major organised players in India's used car segment. The company operates at significant scale, requiring robust frontend systems and customer authentication solutions.

Position: Software Development Engineer 3 – Frontend
Location: Bangalore (Remote/Hybrid Options Available)
Compensation: 25 LPA Fixed + 10 LPA ESOPs
Primary Skills Tested: JavaScript, React, Next.js, TypeScript, Data Structures, Performance Optimization
Final Outcome: Offer Received (Declined for better opportunity)

Interview Process

The interview process consisted of four distinct rounds, each designed to assess different competencies:

1. Round 1: JavaScript Fundamentals (60 minutes)
2. Round 2: Machine Coding Round
3. Round 3: Hiring Manager Round
4. Round 4: HR + Culture Fitment Discussion

Each round progressively evaluated technical depth, problem-solving abilities, and cultural alignment.

Technical Rounds

Round 1: JavaScript Fundamentals

The first round focused on core JavaScript concepts through output-based questions and polyfill implementations.

Hoisting and Temporal Dead Zone

The candidate was asked to explain hoisting behavior with var, let, and const. Key concepts discussed included:

• var declarations are hoisted and initialized with undefined
• let and const are hoisted but remain uninitialized, creating a Temporal Dead Zone (TDZ)
• Accessing variables in TDZ results in a ReferenceError

console.log(a); // undefined (var is hoisted)
var a = 5;

console.log(b); // ReferenceError (TDZ)
let b = 10;

call, bind, and apply Methods

The interviewer tested understanding of function context manipulation. The candidate was asked to implement a bind polyfill: