🚀 React Interview Experience (August 2025): HCL(Part -4)

Overview

This document provides a detailed account of a React Developer interview conducted at HCL in August 2025. The interview focused on assessing the candidate's understanding of React fundamentals, their ability to implement best practices, and their experience with building scalable and maintainable frontend applications. The questions ranged from basic React concepts to advanced topics like lazy loading, server-side rendering, and internationalization.

Interview Rounds

The interview process included questions covering the following key areas:

• React Initialization: The candidate was asked to describe how a React application is built upon initial setup, including the tools used and the sequence of events from project initialization to UI rendering.
• Lazy Loading: The candidate was questioned on how to implement lazy loading in React to optimize initial load times, including the use of React.lazy() and Suspense.
• Backend Integration: The interview explored how to integrate a React frontend with backend servers like Node.js or Django, focusing on API design, environment configuration, and authentication.
• Rendering Techniques: The candidate was asked to explain the differences between Client-Side Rendering (CSR), Server-Side Rendering (SSR), and Static Site Generation (SSG), including their respective advantages and disadvantages.
• Internationalization (i18n): The interview covered the concept of i18n and how to implement it in a React application using libraries like react-i18next.

Specific Questions and Answers:

Q16: When you first initialize, how will the application be built using React?

The candidate explained the step-by-step breakdown, including:

1. Project Initialization: Using tools like npx create-react-app or npm create vite@latest. Mentioning the preference for Vite with TypeScript.
2. Build/Compile Phase: Detailing JSX/TSX compilation by Babel or ESBuild, bundling, and the use of a dev server with Hot Module Replacement (HMR).
3. ReactDOM Renders App: Showing how React mounts the root component using ReactDOM.createRoot.
4. Component Mounting and Lifecycle Begins: Describing the lifecycle methods for class and functional components.