Microsoft Software Engineer Interview Questions (2026)
Microsoft's software engineer loop tends to be collaborative and discussion-oriented. Coding rounds favor solid data-structure and problem-solving fundamentals over competition-grade tricks, and interviewers often engage with your thinking as you go rather than watching silently. Senior loops add a design round and deeper behavioral discussion aligned with Microsoft's growth-mindset culture.
Interviewers reward clear communication and genuine collaboration — asking good clarifying questions and responding to hints well is a positive signal, not a weakness. Edge cases, testing your own code, and explaining trade-offs matter as much as reaching the optimal solution.
The questions below reflect Microsoft's common patterns across coding and behavioral rounds. Practice thinking out loud and treating the interviewer as a collaborator; Microsoft's culture question often probes how you learn and work with others.
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Core Technical & Behavioral Questions
Reverse words in a sentence in place.
Reverse the whole string, then reverse each word — O(n) time, O(1) extra space for a mutable buffer. Walk the two-step trick clearly; Microsoft values a clean, well-explained in-place solution.
Find the middle of a linked list in one pass.
Fast/slow pointers. State the invariant (fast moves twice per slow step) and the even-length edge case. A classic Microsoft fundamentals check.
Check whether two strings are anagrams.
Frequency count (26-array or hash map), O(n). Clarify case and Unicode handling first — asking that clarifying question is itself a positive Microsoft signal.
Lowest common ancestor in a binary (search) tree.
For a BST, walk down comparing values, O(h). For a general binary tree, recurse and return where left and right subtrees both report a target. Distinguish the two cases explicitly.
Implement a function to compute sqrt(x) without the library call.
Binary search on the answer, or Newton's method; discuss precision and integer vs float versions. Microsoft likes seeing you reason about convergence and edge cases (0, 1, negatives).
Design a parking lot / an elevator system (OO design).
Identify entities, responsibilities, and interfaces; discuss how classes interact and where to extend. Microsoft's design rounds often probe object-oriented modeling and clean abstractions, not just scale.
Detect if a string has all unique characters.
Hash set or a bitmask for a fixed alphabet (O(1) space). Mention the no-extra-data-structure follow-up. Quick to solve, so spend the time on clean code and tests.
Tell me about a time you learned a new technology quickly to ship something.
STAR with a growth-mindset framing — Microsoft's culture explicitly values learning. Show how you ramped, what you delivered, and what the experience taught you.
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