Microsoft Interview Experience. Compensation: ~39 LPA

Overview

Microsoft is a global technology leader known for its enterprise software, cloud services, and innovative consumer products. The company offers competitive compensation packages for software development engineers, with SDE-1 Frontend positions commanding substantial salaries and comprehensive benefits.

This article documents the interview experience for the SDE-1 Frontend role at Microsoft, providing a comprehensive breakdown of the technical assessments and system design discussions encountered throughout the multi-round process.

Interview Process

The interview process for the SDE-1 Frontend position at Microsoft consisted of three rigorous technical rounds:

1. Round 1: DSA & JavaScript Problem Solving
2. Round 2: Frontend System Design
3. Round 3: Frontend Design - Real-Time Doc Editor

The application was submitted through a referral, and the position offered a competitive compensation package of approximately 39 LPA.

Technical Rounds

Round 1: DSA & JavaScript Problem Solving

The first round thoroughly evaluated the candidate's problem-solving abilities and JavaScript fundamentals:

• Longest Substring Without Repeating Characters: The candidate was tasked with implementing an O(n) solution. The discussion covered critical edge cases including empty strings, large input handling, and scenarios where all characters are identical.

• Promise.all() Implementation: The candidate was required to implement Promise.all() from scratch, demonstrating deep understanding of Promise handling and asynchronous programming patterns in JavaScript.

• Promise.all() vs Promise.race(): The interviewer explored the fundamental differences between these Promise methods—one resolves when all Promises complete successfully, while the other resolves as soon as any Promise settles.

• Preserving Resolved Order and Error Handling: The candidate explained how Promise.all() maintains the original array order of resolved values regardless of completion sequence, and properly propagates rejection errors.

• Async Logging Order: Questions were posed about the execution order of asynchronous logging operations, testing the candidate's understanding of the JavaScript event loop and microtask queue.

Round 2: Frontend System Design