Microsoft Software Development Engineer Interview Questions (2026)
The 15 Software Development Engineer interview questions most worth practising for Microsoft, selected from a bank of 165. Below: the interview process, the questions with answer outlines, the topics tested, and how to prepare.
Team-based hiring where the loop runs inside the hiring org, typically 4-5 rounds in a single virtual/onsite day, ending with an 'As Appropriate (AsApp)' round with a senior manager who has effective veto; friendlier pacing than Google/Meta with more emphasis on practical problem solving.
Questions
15
from a 165-question bank
Difficulty
Medium
from our question mix
Rounds
6
typical loop
Microsoft rating
3.78/5
Top 99% in Software Product
Microsoft's interview process
- 1Recruiter screen30 minEasy
Role alignment, team options, and logistics with a recruiter.
- 2Online assessment (Codility)60 minMedium
Timed coding problems used mainly for early-career and campus screening in India.
- 3Coding interview 145 minMedium
DSA problem with production-quality code, testing, and edge cases in a shared editor.
- 4Coding interview 245 minHard
Harder algorithmic problem plus discussion of a past project's technical decisions.
- 5System design round60 minHard
Design a practical service (e.g. Teams presence, OneDrive sync) with API contracts and Azure-flavored components.
- 6As Appropriate (AsApp) round45 minMedium
Senior manager assesses growth mindset, long-term potential, and overall fit; effectively the closing behavioral gate.
Software Development Engineer interview questions for the Microsoft loop
- Q1
For a platform component design round, answer this: Design a reusable API client for OneDrive with auth refresh and request signing
HardLow Level DesignAPI client with authHow to answer:Separate HttpClient, AuthProvider, TokenStore, RequestSigner, RetryPolicy, and Serializer; refresh tokens safely and avoid logging secrets. Show interfaces, testability, and integration with existing platforms.
- Q2
In a distributed-systems design discussion, answer this: Design an ad-serving system for Outlook
HardHigh Level DesignAd servingHow to answer:Separate request routing, candidate retrieval, auction/ranking, budget pacing, frequency capping, logging, and fraud detection; optimize p99 latency. Include testing, service boundaries, HA, and customer scenarios.
- Q3
In a problem-solving technical interview, solve this: Infer character order from sorted Copilot labels in an unknown alphabet
MediumDSAAlien dictionaryHow to answer:Build precedence edges from first differing characters, then topologically sort. O(total characters); detect invalid prefixes and cycles. Clarify assumptions and test before saying done.
- Q4
For a platform component design round, answer this: Design a low-level audit logger for Office administrative actions
MediumLow Level DesignAudit log componentHow to answer:Model AuditEvent, Actor, Target, Metadata, Sink, and Redactor; ensure append-only semantics and safe handling of PII. Show interfaces, testability, and integration with existing platforms.
- Q5
In a problem-solving technical interview, solve this: Implement autocomplete over a static set of Xbox terms
MediumCodingAutocomplete functionHow to answer:Build a trie or sorted array with binary-search prefix range; return ranked top N; test empty prefix, Unicode, and tie ordering. Clarify assumptions and test before saying done.
- Q6
In a problem-solving technical interview, solve this: Validate nested delimiters in a Office expression language
HardDSABalanced parenthesesHow to answer:Use a stack of opening delimiters and match each closing delimiter. O(n), O(n); reject mismatches and leftover openings. Clarify assumptions and test before saying done.
- Q7
In a problem-solving technical interview, solve this: Implement a batcher for Outlook events that flushes by size or time
MediumCodingBatching helperHow to answer:Buffer events, flush when max size or max age is reached, make flush thread-safe, and test empty, timer, size, and failure behavior. Clarify assumptions and test before saying done.
- Q8
In a problem-solving technical interview, solve this: Find the first and last occurrence of a target in sorted Azure results
HardDSABinary search boundariesHow to answer:Run two boundary binary searches for lower_bound and upper_bound-1. O(log n); test empty array and missing target. Clarify assumptions and test before saying done.
- Q9
For a platform component design round, answer this: Design classes for a OneDrive calendar that prevents double booking and supports recurring events
MediumLow Level DesignCalendar bookingHow to answer:Use Calendar, Event, RecurrenceRule, Attendee, and ConflictChecker; store intervals per calendar; expand recurrence lazily within a query window. Show interfaces, testability, and integration with existing platforms.
- Q10
In a distributed-systems design discussion, answer this: Design a real-time chat service for Teams
MediumHigh Level DesignChat serviceHow to answer:Use conversation service, websocket gateways, message store, delivery receipts, push notifications, and idempotent message IDs; discuss ordering and offline sync. Include testing, service boundaries, HA, and customer scenarios.
- Q11
In a problem-solving technical interview, solve this: Implement a circuit breaker wrapper around a Office dependency
HardCodingCircuit breakerHow to answer:Track failures over a window, open when threshold is exceeded, allow half-open probes after cooldown, and test state transitions. Clarify assumptions and test before saying done.
- Q12
In a problem-solving technical interview, solve this: Implement undo/redo for Windows Update edit commands
HardCodingCommand undo stackHow to answer:Represent operations as commands with apply/undo; maintain undo and redo stacks; clear redo on new operation and test ordering. Clarify assumptions and test before saying done.
- Q13
In a problem-solving technical interview, solve this: Implement a high-throughput counter for Xbox metrics
MediumCodingConcurrent counterHow to answer:Start with atomic increments; for contention, shard counters and sum on read. Test race conditions and document eventual read cost. Clarify assumptions and test before saying done.
- Q14
With specific role-related examples, answer this: Tell me about a disagreement with a teammate while building Xbox
SeniorBehavioralConflictHow to answer:Show respectful disagreement: state shared goal, compare evidence, make or support a decision, and explain the business/user result. Connect the example to customer impact, learning, and team collaboration.
- Q15
In a distributed-systems design discussion, answer this: Design live event delivery for Xbox
HardHigh Level DesignContent delivery for live eventsHow to answer:Use ingest encoders, segmenter, origin, CDN, manifest updates, latency tuning, player telemetry, autoscaling, and regional failover. Include testing, service boundaries, HA, and customer scenarios.
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Topics tested most
How to prepare for the Microsoft Software Development Engineer interview
Practice coding with clear communication; show a growth mindset; know your past projects deeply
Frequently asked questions
How hard is the Microsoft Software Development Engineer interview?
Based on our 165-question Software Development Engineer bank for the Microsoft loop, the overall difficulty is medium (Microsoft's process is generally rated elevated). Expect around 6 rounds spanning A/B testing platform, API client with auth, Ad serving.
How many interview rounds does Microsoft have for a Software Development Engineer?
Microsoft typically runs about 6 rounds for Software Development Engineer candidates: Recruiter screen → Online assessment (Codility) → Coding interview 1 → Coding interview 2 → System design round.
What is the interview process at Microsoft?
The Microsoft interview process typically runs: Recruiter screen -> technical screen -> 4 'loop' rounds (coding, design, behavioral) -> as-appropriate (AA) debrief. Prepare for each round in order rather than only the first — the later stages usually carry the most weight.
How hard is the Microsoft interview?
Microsoft interviews are rated high difficulty. The bar is highest on coding — go deep there and practise explaining your reasoning out loud.
What does Microsoft look for in candidates?
Microsoft focuses on Coding, problem-solving, collaboration, growth mindset. Culturally, it values Growth mindset, customer obsession, inclusive collaboration. Line up your examples to hit both the technical bar and these values.
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Compiled by PrepNPlaced from 165+ interview reports and question banks for the Microsoft Software Development Engineer loop, cross-referenced with 2,179 employee reviews. Data refreshed 2026-08-13. Updated 2026.