React Interview Experience (July 2025): Siemens

Overview

This article details a React Developer interview experience at Siemens from July 2025. The position was for a Frontend Developer role focused on React development. The interview process assessed both fundamental JavaScript knowledge and React-specific concepts, with a strong emphasis on practical coding abilities and problem-solving skills.

Siemens, a global technology company, conducts thorough technical interviews for frontend positions. The interview covered a wide range of topics from basic JavaScript array methods to advanced React concepts like the Virtual DOM and performance optimization techniques.

Interview Process

The interview consisted of a single comprehensive technical round focused on:

• JavaScript Fundamentals: Array methods, object destructuring, async programming, and event loop mechanics
• React Core Concepts: JSX, Virtual DOM, controlled vs uncontrolled components, hooks, and memoization
• TypeScript Basics: Variable declarations, type annotations, and enums
• Problem Solving: Pattern printing and algorithmic thinking

The interviewer asked approximately 15-16 questions spanning these domains, with follow-up questions on certain topics to gauge depth of understanding.

Technical Rounds

JavaScript Questions

Array Filtering Problem

The candidate was asked to filter an array of objects containing person data (name and city) to return only objects where the city is 'Pune'. This tested understanding of the .filter() array method:

const arr = [
  { name: 'Rahul', city: 'Mumbai' },
  { name: 'Rohit', city: 'Pune' },
  { name: 'Raj', city: 'Mumbai' },
  { name: 'Arjun', city: 'Pune' },
  { name: 'Rajesh', city: 'Mumbai' }
];

const result = arr.filter(person => person.city === 'Pune');
// Output: [{ name: 'Rohit', city: 'Pune' }, { name: 'Arjun', city: 'Pune' }]

Object Destructuring

The interviewer asked about object destructuring in JavaScript ES6. The candidate explained the syntax including basic extraction, renaming properties, and destructuring in function parameters:

const user = { name: 'Richa', age: 30 };
const { name, age } = user;

// Renaming
const { name: userName } = user;

// Function parameters
function greet({ name }) {
  console.log(`Hello, ${name}`);
}

Pattern Printing Problems