← Back to Directory

Microsoft interview notes, page 36 of 60

FAANG / Big Tech

Most of these Microsoft write-ups come from Software Engineers (372), then Product Managers (124) and Machine Learning Engineers (53). The most reported rounds are the technical phone screen (255), the product sense round (111), the system design round (93) and the behavioral / leadership round (49).

597 interview notes · updated Oct 2026

Microsoft·Product Manager·Onsite - Product Sense / Strategy

May 2026
Interviewed for a PM role at Microsoft and got hit with a strategy question about the LinkedIn acquisition. Not a lot of process to report, just the one question that I remember.
  • Why did Microsoft acquire LinkedIn?

“I stumbled through this more than I expected.”

View Post

Microsoft·Software Engineer·Onsite - System Design / Architecture

Jun 2026
Microsoft system design round, focused entirely on a large-scale telemetry pipeline. The question had a lot of surface area and I'm not sure I covered it well enough given the time.
  • Design a distributed system that collects telemetry data from millions of devices, supporting both real-time streaming analytics and batch processing for offline aggregation. Walk through ingestion, storage, processing, and querying.

“I spent too long on the ingestion layer and ran out of steam by the time we got to querying.”

View Post

Microsoft·Software Engineer·Technical Phone Screen

Jun 2026
Microsoft technical phone screen, C# focused. One question, pretty deep, and they wanted working async code not just pseudocode. Left feeling like I probably over-engineered part of it but the core logic held up.
  • You have three functions: an async ReadStream() that returns bytes, DecodeBytesToObject(bytes) that turns bytes into an object, and DecodeBytesToInt(bytes) that parses bytes as an integer. Using these, write a method in C# that reads a length-prefixed stream and returns a list of decoded objects. The interviewer wanted async/await and IAsyncEnumerable used appropriately.

“The length-prefix framing took me a second to internalize.”

View Post

Microsoft·Software Engineer·Onsite - System Design / Architecture

Jun 2026
Microsoft system design round for what I'd guess is a senior backend or infrastructure role. The URL shortener problem sounds deceptively simple but they pushed hard on scale and failure modes, two follow-ups that really separated the candidates who'd actually built distributed systems from those who'd just read about them.
  • Design a URL shortener that supports creating short URLs, redirecting, optional expiry, optional analytics, and an admin dashboard. Assume roughly 1 million creates per day and 1 billion redirects per day.
  • How would you achieve low latency globally for this system, given that users are spread across different regions?
  • How would you handle a sudden spike in URL creation requests, say QPS jumping from around 400 to 1000, without dropping any requests or making the synchronous API feel slow?

“The core design isn't where you lose points, it's the scale numbers.”

View Post

Microsoft·Software Engineer·Onsite - Multi Round

Jun 2026
Microsoft SWE onsite, second round. Two parts back to back: behavioral first, then a coding and design problem about org chart traversal with a read-heavy optimization angle. The design follow-up is where things got interesting.
  • Tell me about a past project and how you collaborated with others on it.
  • You're given a set of manager/direct-report pairs that form an org chart. Design a service that, given an employee ID, returns the total number of people under that employee transitively. The workload is read-heavy, so optimize for fast reads.
  • If a single relationship in the org chart changes, like an employee moves to a new manager or someone leaves, how do you update the precomputed counts while keeping everything consistent? Walk through the correctness and cost.

“Standard stuff.”

View Post

Microsoft·Product Manager·Onsite - Product Sense / Strategy

Jun 2026
Microsoft PM interview with a single product design question. Pretty open-ended and I wasn't sure how deep to go on the technical side versus the user experience angle.
  • Design a cookbook app from scratch.

“I started with users, which felt right, but then I kind of spiraled trying to cover every feature I could think of.”

View Post

Microsoft·Data Analyst·Technical Phone Screen

Jun 2026
Interviewed at Microsoft, got a probability question that felt more like a math class than a technical screen. Short and straightforward, but I second-guessed myself more than I should have.
  • When rolling two fair dice, what is the probability that the sum is less than 12?

“I overcomplicated this.”

View Post

Microsoft·Software Engineer·Technical Phone Screen

Jun 2026
Microsoft SWE interview with a distributed systems question. Not a lot of context in what was shared, but the question itself is a solid one that can go pretty deep if the interviewer wants it to.
  • How does leader-follower election work in a distributed system?

“This is the kind of question where you can start okay and slowly realize you don't know the details as well as you thought.”

View Post

Microsoft·Software Engineer·Onsite - Coding / Algorithms

Jun 2026
Microsoft SWE coding round, one problem the whole session. It's a grid traversal thing dressed up in satellite imagery flavor, which I thought was a fun skin on a classic problem.
  • Given a 2D grid of Heat Radiation Index values from 0 to 9, a cell is considered part of a cloud if its value is 4 or below. Return the total number of distinct clouds, where two cloud cells belong to the same cloud only if they are directly adjacent horizontally or vertically.

“It's basically number of islands with a threshold check instead of a '1' vs '0' comparison.”

View Post

Microsoft·Software Engineer·Onsite - Behavioral / Leadership

Jun 2026
Behavioral round at Microsoft for a SWE role, just one question about dealing with blockers from your own team. Short and a bit anticlimactic.
  • What do you do when your own team is blocking your progress?

“I went with a story about a time a teammate's review bottleneck was slowing down a release.”

View Post