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Microsoft interview notes, page 10 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

Apr 2026
Interviewed for a PM role at Microsoft, got a product strategy question about Office for web that seemed straightforward but had a lot of layers once I started talking.
  • How would you drive adoption of Office for web, given that it's a weaker product compared to the desktop version?

“I went straight to the feature gap angle and kind of dug myself into a hole.”

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Microsoft·Machine Learning Engineer·Technical Phone Screen

Apr 2026
Microsoft ML Engineer interview with two coding problems back to back. The k-means one was meaty and the subarray problem was more of a CS puzzle. No behavioral, just code.
  • Implement K-Means clustering from scratch given a list of points, a number of clusters k, a max iteration count, and a tolerance threshold. Use the first k points as initial centroids, handle empty clusters by keeping the centroid unchanged, and return both final centroids and cluster assignments.
  • Given an integer array and a positive integer k, determine whether any contiguous subarray of length at least 2 has a sum divisible by k. Solve it in O(n) time.

“This one took most of the session.”

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Microsoft·Software Engineer·Onsite - Coding / Algorithms

Apr 2026
Microsoft SWE interview that went deep on spatial data structures. One meaty implementation question about QuadTrees, covering both the coding side and the design reasoning behind it.
  • Implement a QuadTree that supports inserting points and querying a rectangular region to return all points within it. Walk through the recursion structure, when to subdivide, and the complexity.

“I knew the concept but implementing it cleanly under pressure was another thing.”

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Microsoft·Software Engineer·Onsite - Behavioral / Leadership

Apr 2026
Behavioral round at Microsoft for a software engineer role, focused entirely on ownership and conflict. Two questions, both the kind where you either have a real story or you don't.
  • Tell me about a project you're most proud of. Walk me through the problem, your specific decisions, and how you owned it from start to finish.
  • Describe a time you had a real disagreement with someone at work, whether a teammate, a manager, or a stakeholder. What was it about and how did you handle it?

“This is the question where I rambled for too long on context and didn't get to the actual trade-offs until they nudged me.”

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Microsoft·Product Manager·Onsite - Product Sense / Strategy

Apr 2026
PM-style case question about launching a new product line in a specific market. Pretty open-ended, which I wasn't fully prepared for going in.
  • Uber is planning to launch a shuttle service in Bangalore, India. How would you approach the launch, and what metrics would you track to measure success?

“I spent way too long on the go-to-market framing and barely got to metrics before time ran out.”

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Microsoft·Machine Learning Engineer·Technical Phone Screen

Apr 2026
Microsoft ML Engineer interview with a coding round focused on K-means. Pretty straightforward topic but the implementation details can trip you up if you're not careful.
  • Implement or explain the K-means clustering algorithm.

“Knew the high-level steps cold but stumbled a bit when they pushed on convergence criteria and how you'd handle empty clusters mid-iteration.”

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Microsoft·Product Manager·Onsite - Product Sense / Strategy

Apr 2026
PM interview at Microsoft, one product design question about Viva Engage. Pretty stripped down, not much to report beyond the question itself.
  • How would you approach building out a new feature for Viva Engage?

“I went with the usual structure: who's the user, what problem are we solving, how does it fit the broader product.”

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Microsoft·Software Engineer·Technical Phone Screen

Apr 2026
Microsoft SWE coding round, just one problem on linked list reordering. Short and to the point, not much else to say about it.
  • Given a linked list, reorder it in a specific pattern (e.g. L0 -> Ln -> L1 -> Ln-1 -> ...).

“Classic linked list manipulation.”

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Microsoft·Software Engineer·Onsite - System Design / Architecture

Apr 2026
Microsoft system design round, one meaty question about building an idempotency API. Felt like I had a decent grasp of the core idea but the concurrent retry edge case tripped me up more than I expected.
  • Design an idempotency API where clients send requests with a unique key, and the server guarantees retried requests return the same response without re-executing the underlying operation. Cover how you'd store keys and results, handle expiry, manage in-flight requests, and deal with concurrent retries of the same key.

“Started fine.”

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Microsoft·Software Engineer·Onsite - System Design / Architecture

Apr 2026
Microsoft system design round focused almost entirely on security for a Copilot-style API service. Dense question, lots of ground to cover, and I felt like I was playing catch-up the whole time.
  • Design a Copilot-style API service with security as the primary concern. Walk through authentication and authorization end-to-end, including how clients get and present credentials, how access tokens are signed and verified, key rotation, token scoping, and protections against misuse like rate limiting, replay attacks, and abuse detection. Also address how you'd scale this while keeping the same security guarantees.

“This is a lot to fit into one question.”

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