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INTERVIEW GUIDE

Microsoft Software Engineer Interview: Questions & Process

Microsoft's software engineer interview is collaborative and fundamentals-heavy: a recruiter screen, an online assessment or coding phone screen, then a 4-round virtual 'loop' mixing coding, light design, and behavioral questions about how you learn and work with others. Expect LeetCode easy-to-medium problems and a culture that prizes growth mindset over flash.

The interview process

1. Recruiter screen — ~30 min call
Tests: background, team interest, why Microsoft, timeline and logistics
2. Online assessment (new grad/intern) — ~90 min, 2 problems on a coding platform
Tests: data-structure fundamentals and clean, correct code under time pressure
3. Technical phone screen — 45-60 min live coding over Teams
Tests: one or two easy-medium algorithm problems plus how clearly you reason out loud
4. The loop (onsite) — 4 back-to-back 45-60 min rounds
Tests: coding, light object-oriented or system design, and behavioral across multiple interviewers
5. As-appropriate (AA) round — 45-60 min with a senior engineer or hiring manager
Tests: depth, judgment, and overall bar-raising fit — this interviewer has extra weight in the decision

Questions you're likely to get

Technical

  • Reverse a singly linked list, then explain how you'd do it iteratively vs. recursively.
  • Given an array, find the contiguous subarray with the largest sum (Kadane's).
  • Count the number of islands in a 2D grid of land and water.
  • Design an LRU cache with O(1) get and put.
  • Merge a list of overlapping intervals.
  • Validate whether a string of brackets is balanced.

Role-specific

  • Walk me through the design of a basic file system or a key-value store — what classes and methods would you define?
  • How would you test the function you just wrote? What edge cases worry you?
  • Explain a project from your resume end to end — what was hard, and what would you change?

Behavioral

  • Tell me about a time you had to learn an unfamiliar technology quickly.
  • Describe a time you received tough feedback. What did you do with it?
  • Tell me about a disagreement with a teammate and how you resolved it.
  • Give an example of a time you failed or shipped a bug. What did you learn?

Practice these problems live

Relevant LeetCode problems for the Microsoft Software Engineer loop. Start a live, AI-run coding interview on any of them — or open the problem on LeetCode.

▶ Reverse Linked List· Easy · LeetCode #206
Linked-list reversal is a Microsoft staple and tests clean pointer manipulation.
▶ Maximum Subarray· Medium · LeetCode #53
Kadane's max-subarray shows up often and rewards a tidy DP explanation.
▶ Number of Islands· Medium · LeetCode #200
Number of Islands is a classic Microsoft grid/BFS-DFS question.
▶ LRU Cache· Medium · LeetCode #146
LRU Cache is the signature design-meets-coding problem in their loop.
▶ Merge Intervals· Medium · LeetCode #56
Merge Intervals tests sorting plus careful edge-case handling.
▶ Valid Parentheses· Easy · LeetCode #20
Valid Parentheses is a common warm-up that checks stack fundamentals.

How to answer (worked examples)

Design an LRU cache with O(1) get and put.
State the data structures before you code: a hash map for O(1) lookup plus a doubly linked list to track recency. Narrate the invariant — most-recently-used at the head, evict from the tail. Code the helper methods (addToFront, remove) first so the main logic stays clean, then walk an example through get and put. Microsoft rewards clear structure and naming as much as correctness.
Tell me about a time you had to learn an unfamiliar technology quickly.
STAR. Situation: the deadline or gap that forced it. Task: what you specifically needed to learn. Action: the concrete way you ramped (docs, a small prototype, asking a mentor the right question). Result: what you shipped — and one sentence on the learning habit you kept. Microsoft is explicitly screening for 'growth mindset,' so make the learning process the hero of the story.

What Microsoft looks for

FAQ

Is the Microsoft SWE interview harder than other big tech?

Generally a bit more approachable than Google or Meta on raw algorithm difficulty — mostly LeetCode easy-to-medium. The bar is real, but Microsoft weighs communication, collaboration, and growth mindset heavily alongside the code.

Do I need to do the online assessment?

For most new grad and intern pipelines, yes — it's an early filter with two timed coding problems. Experienced-hire loops more often start with a live phone screen instead.

What is the 'AA' or as-appropriate interviewer?

It's a senior interviewer, often from outside the immediate team, whose vote carries extra weight as a bar-raiser. Treat that round as the one where depth and judgment matter most.

How long does the whole process take?

Typically 3-5 weeks from recruiter screen to decision, though team-matching and scheduling can stretch it.

What language should I code in?

Use whatever you're fastest and cleanest in — C#, Java, Python, and C++ are all common. They care about your problem-solving and clarity, not the stack.

Walk into the Microsoft loop already warmed up

Reading the questions isn't the same as solving them out loud while someone watches. Practice this exact loop — the coding rounds, the design walk-through, the growth-mindset behavioral — with OfferLoop's realtime voice coach before the real thing.

Practice this interview out loud →

Related

All Microsoft interviews →Microsoft Data Analyst interview →Microsoft Data Scientist interview →Microsoft Data Engineer interview →Microsoft Machine Learning Engineer interview →

OfferLoop is an independent interview-practice tool and is not affiliated with, endorsed by, or sponsored by Microsoft. All company names and trademarks are the property of their respective owners.

Interview formats vary by team, level and year, and this guide is compiled from general knowledge of publicly discussed hiring processes — treat it as preparation material, not an official description of Microsoft's current process.