My Interview Experience for an SDE-2 Frontend Position at Zepto and Advanced JavaScript Coding…

Overview

This document outlines the interview experience for a Senior Frontend Engineer (SDE-2) position at Zepto. The interview process covered core JavaScript concepts, problem-solving abilities, UI design skills, and discussions on scalability and maintainability within frontend development. The candidate's experience provides insights into the technical expectations for senior frontend roles and offers advanced coding problems to enhance understanding of key JavaScript and frontend development techniques.

Interview Rounds

The interview process consisted of three rounds:

1. JavaScript Round

This round focused heavily on JavaScript fundamentals. The candidate was tested on the following concepts:

• Event Loop: The candidate was asked to explain how the event loop manages asynchronous tasks and the execution order of different tasks, including Promises and setTimeout.
• Promises and Async/Await: The discussion involved handling asynchronous operations using Promises and async/await, including their differences and how async/await enhances code readability and maintainability.
• Hoisting: The candidate was questioned on how variables and functions are hoisted in JavaScript, with specific attention to the behavior of var, let, and const.
• Closures: The interviewer presented use cases for closures and requested an explanation of their underlying mechanism, especially concerning function scopes and variable retention.
• Prototypes and Inheritance: The candidate demonstrated knowledge of object-oriented programming in JavaScript through a deep dive into JavaScript's prototype chain and the Object.create() method.
• The "this" Keyword: Understanding the behavior of this in different contexts, such as event handlers and object methods, was assessed.
• Flattening Objects: The candidate showcased techniques for flattening deeply nested objects.

2. Machine Coding Round

This round was a practical coding challenge that involved designing a form-based UI using React.js in CodeSandbox. The requirements included creating three tabs (Profile, Interest, and Settings) with specific field validations:

• Age Field: Only numeric values were allowed.
• Email Field: Validation to ensure the correct format.