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Microsoft interview notes, page 50 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

Jun 2026
PM strategy question for Microsoft, framed as a WhatsApp scenario around kids and the lockdown period. Short and punchy but surprisingly tricky to structure on the spot.
  • You're a PM at WhatsApp. How would you grow the platform's market share among kids during a lockdown period?

“I spent too long on user segmentation and not enough on the actual product moves.”

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Microsoft·Software Engineer·Online Assessment (OA)

Jun 2026
Microsoft coding interview, one algorithmic problem that looks straightforward until you realize the naive approach won't cut it on larger inputs.
  • Given an integer array and a list of queries, for each query find the maximum length of a subsequence whose sum does not exceed the query value.

“My first instinct was just iterate through for each query, classic O(n*m) brute force.”

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Microsoft·Software Engineer·Onsite - System Design / Architecture

Jun 2026
System design round at Microsoft for a software engineering role, focused entirely on building a search autocomplete system. Pretty deep dive, they pushed hard on every layer of the stack.
  • Design a search autocomplete system that returns relevant suggestions as a user types a prefix, with low latency at scale.
  • What APIs would you expose for querying autocomplete suggestions and for updating the underlying data corpus?
  • How would you model and store the suggestion data to support efficient prefix lookups?
  • How would you rank autocomplete results using signals like popularity, language, recency, and user behavior?
  • How would you handle frequent corpus updates, cache invalidation, and high query volume without sacrificing latency?
  • What trade-offs would you make between latency, memory usage, and data freshness in this system?

“This was the core question and it sprawled into basically everything.”

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Microsoft·Machine Learning Engineer·Technical Phone Screen

Jun 2026
Microsoft ML Engineer interview with an array problem that looks simple but has a few edge cases worth thinking through carefully. Nothing too wild, just clean problem solving.
  • Given an unsorted integer array, find the minimum absolute difference between any two distinct elements, then return all pairs that achieve that minimum difference. Each pair should be ordered smallest to largest, and the list of pairs should be sorted ascending by first element.

“My first instinct was brute force, compare every pair, O(n^2).”

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Microsoft·Software Engineer·Technical Phone Screen

Jun 2026
Microsoft SWE coding round, one problem the whole time. Pretty focused session, just bit manipulation and greedy thinking under pressure.
  • Given a non-negative integer target, you start at 0 and can add or subtract any power of two in each operation. What is the minimum number of operations to reach the target?

“My first instinct was just greedy from the top, grab the largest power of two that fits and subtract.”

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Microsoft·Machine Learning Engineer·Technical Phone Screen

Jun 2026
Microsoft ML engineer interview, got asked a pretty standard regularization question. Nothing too wild but it's the kind of thing that trips you up if you haven't thought about it carefully in a while.
  • What are the differences between L1 and L2 regularization?

“I knew the basics, L1 pushes weights to zero so you get sparsity, L2 penalizes large weights but keeps them small rather than zeroing them out.”

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Microsoft·Software Engineer·Onsite - Behavioral / Leadership

Jun 2026
Microsoft SWE behavioral round, about 30 minutes, focused on bias for action and systems thinking. Pretty standard loop but those two themes came up hard and fast.
  • Tell me about a time you acted quickly without having all the information you needed.
  • Describe a situation where you had to think through how different parts of a system or organization would be affected by a change you were making.

“This is the classic bias for action prompt and I fumbled the setup a bit.”

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Microsoft·Software Engineer·Technical Phone Screen

Jun 2026
Microsoft SWE coding round, pretty straightforward data manipulation problem. Nothing too wild but it's the kind of thing that trips you up if you overthink it.
  • Given a list of row dictionaries where each dict maps column names to values, write a function that takes a column name and returns all values for that column across every row, in order.

“Basically a columnar slice of a list of dicts.”

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Microsoft·Software Engineer·Onsite - Behavioral / Leadership

Jun 2026
Interviewed for a PMM role at Microsoft, just the one behavioral question from what I can tell. Pretty standard customer empathy territory.
  • Tell me about a time you struggled to figure out what a customer actually needed in order to recommend the right product or service.

“I had a story ready but partway through I realized I was describing a situation where I kind of just guessed and got lucky, which is not a great look.”

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Microsoft·Software Engineer·Technical Phone Screen

Jun 2026
Microsoft SWE interview with a grid-based coding problem that was a follow-up to something I'd seen before, which sounds great until you realize the variation trips you up anyway.
  • Given a 2D grid where cells with a value of 4 or less are considered 'cloud' cells, find the area of the largest connected cloud region using 4-directional connectivity.

“I'd done the count-clouds version before so I figured this would be easy.”

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