Microsoft Software Engineer Interview Questions

1.Tell me about a time you had to pick up a technology or language you'd never used before to unblock your team. How quickly did you get productive, and what did that ramp look like?

2.Tell me about a technical decision where someone on your team — maybe a junior engineer or someone from a different background — flagged a problem you'd overlooked. What happened?

3.Tell me about a time when you received critical feedback on your work. How did you respond?

4.Describe a time when you collaborated with someone who had a very different working style. How did you make it work?

5.Walk me through a time you discovered that what customers were asking for wasn't actually what they needed. How did you figure that out, and what did you ship instead?

6.Describe a time you needed something from another team — an API, a shared service, a platform feature — and they weren't prioritizing it. How did you get unblocked without burning the relationship?

7.Tell me about a piece of work you shipped that had a real impact on users — not just a metric moving, but something you know changed how people worked or solved a real problem they had. How do you know it mattered?

8.Tell me about a time you got deep into a problem only to realize your mental model of how the system worked was completely wrong. What did you do once you knew you were lost?

9.You're writing a C# service in ASP.NET Core that calls an external dependency — say, an Azure Cognitive Services endpoint. How do you make sure one slow or failing dependency doesn't bring down your whole service?

10.You have a PowerShell script that was working fine but is now hanging intermittently in a CI/CD pipeline — no error, just stalls for minutes before timing out. How would you debug it?

11.How would you design an API that needs to support both breaking and non-breaking changes over time?

12.You're building a feature in a Microsoft 365 service that needs to store per-user settings — think something like user preferences for a Teams app. Cosmos DB is your database. How do you decide on your partition key, and what goes wrong if you get it wrong?

13.Your team's Azure service has a memory leak that only surfaces after running for about 72 hours in production — it never reproduces in staging. How do you approach diagnosing and fixing it without taking the service down?

14.Design a cloud-based document collaboration system like OneDrive and Office Online.

15.Copilot features in Microsoft 365 need to stream responses token-by-token to the client, like ChatGPT does. Walk me through how you'd design the backend-to-frontend streaming pipeline for something like Copilot in Word — from the LLM call to text appearing in the document editor.

16.You're on the Azure Blob Storage team and need to design a soft-delete and versioning feature so that enterprise customers can recover accidentally overwritten or deleted files. What does your data model and recovery flow look like?

17.Teams needs to show a user's 'presence' status — online, away, busy, offline — to everyone in their organization in near real time. How would you design the presence service for a tenant with 100,000 users?

18.You're designing the rate-limiting layer for the Azure OpenAI Service API — the one that enforces tokens-per-minute quotas for enterprise customers. How do you build it to be both accurate and fast enough to not add meaningful latency to every API call?

19.GitHub needs to generate a dependency graph for a repository — showing which packages a project depends on and which repos depend on it — and surface it in the UI within a second of page load. How would you design the pipeline that builds and serves that graph?

20.You're designing the leaderboard system for Xbox Game Pass — it needs to rank millions of players globally by score for a game like Halo, support real-time updates as scores come in, and serve reads for both a player's own rank and the top 100 globally. How do you architect this?

21.LinkedIn's 'People Also Viewed' sidebar recommends profiles similar to the one you're currently viewing, and it needs to update as the professional network evolves. Design the system that generates and serves those recommendations at LinkedIn's scale.

22.Tell me about a time you pushed back on a technical direction your team or manager had already committed to. What made you speak up, and what happened?

23.You've been working on a feature for a few weeks when you realize the approach your team aligned on at the start is technically sound but will create a rough experience for enterprise IT admins who have to deploy it at scale. You're not the DRI. What do you do?

24.Teams has around 300 million monthly active users. If we wanted to reduce the average meeting join time by one second, how would you estimate the productivity value that creates for Microsoft customers?

25.You're building a feature that works well for 95% of users but causes issues for 5%. How do you approach this?

26.The daily active usage rate of Copilot in Word has been flat for six weeks despite strong initial adoption — users activate it, use it once or twice, then stop. How do you diagnose what's happening and what would you fix first?

27.GitHub hosts over 400 million repositories. If we wanted to estimate the total storage cost reduction from compressing all Git objects that haven't been accessed in over a year, how would you structure that analysis?

28.Azure SQL Database is used by millions of enterprise customers, and one of its internal services is showing a 15% increase in connection pool exhaustion errors over the past 48 hours — no deployments, no config changes, no alerts from the database layer itself. What's your investigation plan?

29.Microsoft 365 processes billions of emails per day through Exchange Online. If we wanted to introduce a new real-time phishing detection model that requires 50ms of additional processing per message, how would you estimate the total infrastructure cost impact and decide whether the security benefit justifies it?