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Microsoft interview notes, page 40 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·Hiring Manager Screen

Jun 2026
HM round at Microsoft for a software engineering role. Pretty standard stuff: a deep dive on a past project and the usual behavioral questions you'd expect from this kind of screen.
  • Walk me through a significant project you worked on recently.
  • Tell me about a time you had to work through a disagreement with a teammate or stakeholder.

“The deep dive portion.”

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Microsoft·Software Engineer·Onsite - System Design / Architecture

Jun 2026
System design round at Microsoft for a software engineering role. One meaty question about building an incident management agent, and they pushed into some tricky territory around role-based content and scale.
  • Design an agent that handles incident management, where different roles see different content. How would you handle scale and potential abuse?

“The role-based content part I felt okay about, access control layers, scoping what each role can see or act on.”

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Microsoft·Software Engineer·Technical Phone Screen

Jun 2026
Microsoft coding round, graph-based problem that looks straightforward until you actually try to implement it cleanly under pressure. Topological sort with a side of edge cases nobody warns you about.
  • Given a sorted word list from an alien language, figure out the character ordering that's consistent with that dictionary. Build a directed graph by comparing adjacent words and return a valid topological order, or an empty string if a cycle exists or a word appears before its own prefix.

“I got the core idea pretty fast, compare adjacent words character by character, first difference gives you a directed edge.”

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Microsoft·Software Engineer·Technical Phone Screen

Jun 2026
Two-part technical round for an AI Infra role at Microsoft. First half was a PyTorch implementation exercise covering Transformer internals, second half was a hardware performance analysis using the Roofline model. Pretty dense for a single session.
  • Implement scaled dot-product attention, multi-head attention, the position-wise feed-forward block, and a full encoder/decoder layer from scratch in PyTorch. Make sure masking, weight tying, and parameter shapes are all correct.
  • Given the peak FLOPs and peak memory bandwidth of a GPU, use the Roofline model to predict the wall-clock time of a matrix multiplication like QK^T or an FFN projection. Determine whether the operation is compute-bound or memory-bound, then explain how changing batch size, sequence length, or hidden dimension shifts the operating point.

“This took way longer than I expected.”

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Microsoft·Software Engineer·Technical Phone Screen

Jun 2026
Microsoft coding interview, one question about navigating a matrix under certain constraints. Pretty standard algorithmic round, nothing too wild.
  • Given a matrix, find a path from a source cell to a destination cell that satisfies a set of constraints.

“Classic grid traversal.”

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Microsoft·Software Engineer·Onsite - System Design / Architecture

Jun 2026
System design round at Microsoft for a software engineer role, single question but it sprawled into basically every corner of backend design you can think of. Dense session, left feeling like I covered maybe 60% of what they were looking for.
  • Design a re-engagement system for an AI assistant product that handles both proactive notifications to inactive users and in-chat reminder extraction and delivery.

“This question is massive.”

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Microsoft·Software Engineer·Technical Phone Screen

Jun 2026
Microsoft SWE interview with a binary tree visibility problem. Pretty standard algorithmic round, nothing too wild, but the question had a couple of angles worth thinking through.
  • Given the root of a binary tree, return the node values visible from the right side, ordered top to bottom.

“I went with BFS first since it felt safer to explain.”

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Microsoft·Software Engineer·Onsite - System Design / Architecture

Jun 2026
Microsoft SWE interview with a system design question that looked like a data structures problem but kept expanding the more you talked. The whole thing was about trade-offs depending on workload, which I wasn't fully prepared to articulate on the spot.
  • Design an in-memory component that tracks key frequencies from a streaming source, supporting a record(key) operation and a topK(k) operation. How would your implementation differ between a read-heavy workload versus a write-heavy one? For each case, walk through your data structures, time and space complexity, and the trade-offs you're making.

“I started with a hash map for counts and a sorted structure on top, which is fine, but I didn't think carefully enough about which direction to optimize before I started talking.”

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Microsoft·Product Manager·Onsite - Product Sense / Strategy

Jun 2026
Interviewed at Microsoft for a product role and got hit with a classic product sense question about relocating to a new city. Pretty open-ended, which I both liked and found a little paralyzing.
  • How would you improve the experience of moving to a new city?

“I blanked for a second on who the user even was.”

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Microsoft·Software Engineer·Onsite - System Design / Architecture

Jun 2026
Microsoft system design round for a software engineer role, focused entirely on building a typeahead/autocomplete service from scratch. Pretty deep dive, they pushed hard on every layer of the stack.
  • Design a search autocomplete service that returns the top-k query completions for a given prefix in real time. Walk through your data structures, ranking logic, ingestion pipeline, and distributed serving strategy.

“I started with a trie and they immediately asked why not a ternary search tree or an FST.”

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