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Microsoft interview notes, page 7 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·Machine Learning Engineer·Technical Phone Screen

Apr 2026
Microsoft ML Engineer interview where they asked me to implement K-Means from scratch. Pretty deep technical question, they wanted to see the full algorithm not just pseudocode.
  • Implement K-Means clustering from scratch. Given a 2D array of points and a value K, return the cluster assignment for each point and the final centroids. Cover initialization (random or k-means++), the assignment step using Euclidean distance, centroid updates, and convergence checking. Python, NumPy, or PyTorch are all fine.

“I started with random init because k-means++ felt like it would take too long to explain under pressure, and I think that was the right call.”

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Microsoft·Software Engineer·Technical Phone Screen

Apr 2026
Microsoft coding interview, one algorithmic problem the whole session. Pretty focused on getting the optimal solution and not just something that works.
  • Given an integer array and a list of query indices, for each query index return how many times the maximum value of the subarray starting at that index appears in that subarray.

“My first instinct was to just iterate from each query index to the end and track the max and count.”

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Microsoft·Machine Learning Engineer·Technical Phone Screen

Apr 2026
Microsoft ML Engineer interview with two parts: a whiteboard coding section where you build a data quality checker for an LLM training dataset, then a discussion about whether and how to finetune a pretrained model. Pretty technical throughout, no fluff.
  • You have an LLM training dataset where each example has a natural-language prompt, an Excel table, and a model response. Implement a quality-check system that flags low-quality examples, covering things like: prompt validity, table parseability and size, whether the response references columns and rows that actually exist, format compliance, and basic consistency between the prompt's intent and the response.
  • Given a pretrained model from HuggingFace, how would you decide whether finetuning is actually necessary for these table-and-prompt tasks? Walk through the criteria you'd use and, if finetuning is warranted, what approach you'd choose and why.

“This was the meaty part.”

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Microsoft·Software Engineer·Onsite - System Design / Architecture

Apr 2026
Microsoft interview with a single open-ended system design question about building a hotel security system. Not much context given about the role but it felt like a senior-level design round. Pretty broad prompt with a lot of room to go wrong.
  • Design a security system for a hotel that could be located anywhere in the world.

“The 'anywhere in the world' part threw me a bit.”

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Microsoft·Software Engineer·Onsite - System Design / Architecture

Apr 2026
Microsoft system design round, one question about building a trigger word detection system for audio. Pretty open-ended and I spent the first few minutes just trying to figure out where to even start.
  • Design a system that can detect specific trigger words within an audio clip.

“I went straight to the ML pipeline without thinking about the surrounding infrastructure first, which I think was the wrong call.”

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Microsoft·Product Manager·Onsite - Product Sense / Strategy

Apr 2026
Microsoft PM interview with a classic product design case. Just the one question but it took up most of the session, lots of back and forth.
  • How would you solve traffic congestion in Seattle?

“I jumped straight into solutions which was a mistake.”

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Microsoft·Software Engineer·Technical Phone Screen

Apr 2026
Microsoft phone screen for a software engineer role, split into a resume walkthrough and then a pretty brutal concurrency coding section. The second half was no IDE, just you and a text editor explaining deadlocks in real time. Not a relaxed conversation.
  • Walk me through your resume and a recent project, including the trade-offs you made and what specifically you contributed.
  • Here's a classic dining philosophers setup. Write the code, explain exactly why it deadlocks, and then refactor it to be deadlock-free.
  • Two threads acquire two mutexes in opposite orders. Explain the deadlock and show how to fix it using consistent lock ordering.
  • In a producer-consumer scenario with a bounded queue, what goes wrong if you hold a lock across a blocking call, and how do you fix it?
  • How would you detect a deadlock at runtime in a production system?

“Thought this would be the easy warmup.”

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Microsoft·Software Engineer·Technical Phone Screen

Apr 2026
Microsoft interview, one question about testing a probabilistic function. Short and a bit odd, felt more like a warmup than a real round.
  • How would you write a test for a coin flip function?

“Blanked for a second because it sounds trivial until you actually think about it.”

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Microsoft·Software Engineer·Hiring Manager Screen

Apr 2026
Interviewed for a customer success manager role at Microsoft. One behavioral question about handling pushback during presentations. Pretty standard stuff but it made me think more than I expected.
  • How would you handle receiving pushback on a presentation you've given?

“I fumbled this a bit because I started talking about staying calm and listening, which felt too generic the moment it came out of my mouth.”

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Microsoft·Product Manager·Onsite - Product Sense / Strategy

Apr 2026
Microsoft PM interview with a product design question for a personal task management app. Pretty open-ended, which I wasn't fully prepared for.
  • Design a task management app intended for personal use.

“I jumped straight into features and the interviewer kind of just waited.”

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