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Microsoft interview notes, page 9 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
Microsoft product interview, one question that sounds breezy until you realize they want you to actually critique a company you admire without sounding like a fanboy or a hater.
  • Pick a company you're genuinely excited about. If you were its CEO, what would you do differently?

“I picked a company I actually cared about and that backfired a little because I spent too long gushing before getting to the 'what I'd change' part.”

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Microsoft·Software Engineer·Onsite - Coding / Algorithms

Apr 2026
Microsoft SWE interview that went deep on caching internals. Started with a classic LRU implementation and then got pushed into concurrency territory pretty quickly, which I wasn't fully prepared for.
  • Implement an LRU cache that supports get and put operations in O(1) average time.
  • How would you extend the LRU cache to be thread-safe under concurrent reads and writes? Walk through different locking strategies and their trade-offs.

“Knew this one cold.”

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Microsoft·Software Engineer·Technical Phone Screen

Apr 2026
Microsoft SWE interview with a meaty algorithmic problem that mixed string parsing, DP, and trie/hashing design tradeoffs. The question had several layers and the complexity analysis portion caught me a bit flat-footed.
  • Given a string s and a dictionary of tokens, determine if s can be broken into a sequence of one or more dictionary words. If yes, return one valid segmentation. Your solution should handle s and dict both up to 100,000 entries. Discuss trie or hash-based prefix pruning, DP with early exits, time and space complexity, and how you'd extend the approach to count all distinct segmentations modulo 1e9+7.

“This is basically word break but they wanted the full treatment.”

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Microsoft·Software Engineer·Technical Phone Screen

Apr 2026
Microsoft SWE interview that went deep on parsing fundamentals. One meaty coding problem that turned into a longer design discussion than I expected.
  • Write a function that checks whether a given string is valid JSON. It should handle objects, arrays, strings with escape sequences, numbers, booleans, and null. Walk through your tokenizer design and parser approach, and cover edge cases like trailing commas, unterminated strings, and recursion depth.

“Started with a regex and the interviewer just kind of waited.”

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Microsoft·Software Engineer·Onsite - System Design / Architecture

Apr 2026
Microsoft system design round focused almost entirely on concurrency control. Three distinct sub-topics, each with follow-ups. Left feeling like I'd studied the right stuff but hadn't gone deep enough on the production tuning angle.
  • How do you decide between coarse-grained and fine-grained locking, and how do you reason about the tradeoff between contention and code complexity?
  • When do lock-free approaches like CAS or MVCC actually pay off, and what are the failure modes you have to watch out for?
  • How does your choice of concurrency mechanism affect tail latency and throughput under contention, and how would you measure and tune this in a production system?

“I started with the obvious stuff, partition-level locks are simpler to reason about, row-level locks scale better under concurrent writes.”

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Microsoft·Product Manager·Onsite - Product Sense / Strategy

Apr 2026
Microsoft PM interview with a single product design question focused on accessibility and inclusive UX for flight booking. Pretty open-ended, which I both appreciated and found stressful in the moment.
  • Design the end-to-end experience for elderly users booking and traveling through flights.

“I jumped straight into pain points for elderly users and started listing accessibility stuff like large fonts and voice assistance, but the interviewer kept nudging me toward the actual journey.”

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Microsoft·Software Engineer·Technical Phone Screen

Apr 2026
Microsoft SWE interview with a graph/greedy problem about settling debts among friends with minimum transactions. Short on details but the problem itself is a classic that's trickier than it looks.
  • Given a list of transactions between a group of friends, find the minimum number of transactions needed to settle all debts.

“The example they gave makes it seem easy: Alice pays Bob $5, Bob pays Bill $5, so just have Alice pay Bill directly.”

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Microsoft·Software Engineer·Technical Phone Screen

Apr 2026
Microsoft SWE interview with a classic matrix problem that looks deceptively easy until you're staring at an O(N^2) brute force and the interviewer is waiting for something better.
  • Given an N×N boolean matrix where entry [i][j] is true if user i follows user j, find the 'Influencer': a user who follows nobody and is followed by everyone else. Return their index, or -1 if none exists. Solve it in O(N) time.

“My first instinct was to just scan every row and column which is obviously N squared and they were not impressed.”

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Microsoft·Software Engineer·Technical Phone Screen

Apr 2026
Microsoft SWE interview with a permutation problem that looked deceptively clean on the surface. One algorithmic question, fairly focused session.
  • Given a permutation of length n, for each k from 1 to n determine whether the elements {1, 2, ..., k} appear as a contiguous subarray. Output a binary string of length n where position k is '1' if such a subarray exists and '0' otherwise. Aim for better than brute force.

“My first instinct was to just check all subarrays and I literally started coding that before catching myself.”

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Microsoft·Software Engineer·Onsite - Behavioral / Leadership

Apr 2026
Went through what felt like a senior-level loop at Microsoft for a Software Engineer role. The questions covered a pretty wide range, from personal pitch to stakeholder war stories to logistics, so it wasn't purely technical.
  • Give a brief self-introduction tailored specifically to this role and team.
  • Why do you want to work at this company and specifically on this team?
  • Walk us through the project you're most proud of: what was the goal, what was your role, what technical and leadership challenges came up, and what was the measurable impact?
  • As someone in a tech lead capacity, describe a time you had to align stakeholders with conflicting priorities, resolve a disagreement, and make a call under uncertainty. What was your reasoning and what did you take away from it?
  • How do you mentor people on your team and push for higher standards overall?
  • What is your earliest available start date, how long is your notice period, and do you have any relocation or visa requirements?

“I over-prepared a generic version of this and had to mentally trim it on the fly.”

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