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Microsoft interview notes, page 48 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·Software Engineer·Onsite - Coding / Algorithms

Jun 2026
Microsoft SWE coding round, no AI tools allowed. Had to implement a SingleFlight component to handle burst traffic in front of an LLM service, and my code didn't compile by the end which I'm pretty sure tanked the whole thing.
  • Design and implement a SingleFlight component that sits in front of an LLM service to batch or deduplicate burst traffic. Then analyze the edge cases your implementation handles.

“The core idea is straightforward enough: if ten requests come in for the same key at the same time, only one should actually hit the backend and the rest should wait and share the result.”

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Microsoft·Product Manager·Onsite - Product Sense / Strategy

Jun 2026
Microsoft PM interview with a single product design question about an electric car dashboard. Pretty open-ended, which sounds fun until you're actually sitting there trying to figure out where to start.
  • How would you design the dashboard for an electric car?

“I went straight to user types and that probably saved me.”

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Microsoft·Software Engineer·Technical Phone Screen

Jun 2026
Interviewed for a security engineer role at Microsoft and got hit with a foundational CTI question pretty early on. Not a bad experience but I kept second-guessing how deep to go.
  • What is cyber threat intelligence and how does a SOC actually use it day to day?

“Seemed straightforward but I rambled a bit trying to cover too much ground at once.”

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Microsoft·Software Engineer·Onsite - System Design / Architecture

Jun 2026
Microsoft system design round for a software engineering role. The main problem was building an in-memory key-value store with snapshot support, and a good chunk of the time went into debating design trade-offs rather than just coding.
  • Design and implement an in-memory key-value store that supports set, get, delete, snapshot, and historical get operations. Walk through the time and space trade-offs between a full-copy approach, copy-on-write, and a per-key version chain. Optimize for fast snapshots and reasonably fast reads on old snapshots.

“I started with the naive full-copy approach just to get something on the board, which the interviewer let me finish before asking what happens when you take a thousand snapshots.”

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Microsoft·Product Manager·Hiring Manager Screen

Jun 2026
Interviewed for a PM role at Microsoft, just one question from what was shared but it's the kind that can trip you up if you haven't really thought it through.
  • Why do you want to be a PM, and what specific experiences have led you to believe this is the right career path for you?

“I had an answer ready but it felt a bit rehearsed coming out.”

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Microsoft·Product Manager·Onsite - Product Sense / Strategy

Jun 2026
PM interview at Microsoft with a single product design question. Pretty open-ended, no real hints on scope or audience constraints.
  • Design a clock specifically for children.

“I went straight to age segmentation and probably spent too long on it.”

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Microsoft·Software Engineer·Technical Phone Screen

Jun 2026
Microsoft coding screen focused on low-level string parsing, specifically writing a JWT decoder from scratch without any libraries. Pretty niche problem that made me realize how much I lean on tooling I've never actually looked inside.
  • Write a function that decodes a JWT token by manually Base64URL-decoding the header and payload portions and parsing each as JSON, without using any JWT library.

“First thing I did was ask whether libraries were fair game, which felt awkward but turned out to be the right call because the whole point was to do it manually.”

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Microsoft·Product Manager·Onsite - Product Sense / Strategy

Jun 2026
Interviewed for a PM role at Microsoft, got asked the classic product launch metrics question. Pretty standard round but it still made me realize how easy it is to ramble without a real structure.
  • What metrics would you use to determine whether a product launch was successful?

“I started listing metrics off the top of my head and about 30 seconds in realized I had no real framework tying them together.”

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Microsoft·Software Engineer·Technical Phone Screen

Jun 2026
Microsoft SWE interview that came down to a tree concepts question. Not much else to report, pretty standard technical screen.
  • What are the key concepts and operations associated with trees?

“Pretty broad question and I kind of rambled through it.”

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Microsoft·Software Engineer·Onsite - System Design / Architecture

Jun 2026
System design round at Microsoft for a software engineer role. The whole session was basically one big distributed systems deep-dive: design a key-value store from scratch, then defend every choice you made under follow-up fire.
  • Design a horizontally scalable distributed key-value store that supports get, put, and delete, stays available under node failures, and redistributes data cleanly as the cluster grows or shrinks.
  • How would you partition billions of keys across many nodes so that adding or removing a single node moves as little data as possible, and how does a client actually locate the right node for a given key?
  • How do you replicate data across nodes, maintain consistency between replicas, and handle conflicting concurrent writes to the same key?
  • What happens when a node is added, removed, or goes down? Walk through both transient and permanent failures and how the cluster repairs itself.
  • Walk through a put operation with three replicas and a write quorum of two, while one of the three replicas is currently unreachable. What happens to the write, and what will a subsequent read with a read quorum of two observe?
  • A single key or a small key range is receiving a disproportionate share of traffic. How do you handle that hotspot?
  • How would you add support for multi-key atomic operations or batched writes, and what does that cost you in terms of latency and availability?
  • How would you handle a value that is 1 MB differently from one that is 10 bytes to keep latency predictable across the board?

“This is the main event and it ate the whole session.”

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