Microsoft Software Engineer Mock Interview

Tell me about a time you worked on a large, high-impact service at Microsoft-like scale—how did you balance reliability, performance, and developer productivity, and what metrics or incidents shaped your decisions?

You’re designing a backend service that must support millions of users with strict latency SLOs—how would you choose between microservices vs. modular monolith, and what would your approach be for designing APIs, caching, and graceful degradation?

Microsoft values “owning the outcome.” Describe a situation where you found a production issue or user-impacting bug, led the triage end-to-end, coordinated with other teams, and ensured the root cause was permanently fixed—what was your role and what changed afterward?

Imagine you’re contributing to a feature for Azure or Microsoft 365 where requirements are initially ambiguous and stakeholders disagree. How would you drive alignment on scope and success criteria, and how would you iterate safely (e.g., feature flags, canary releases, rollback plans) until you shipped?

In a code review, a teammate proposes a change that improves performance but introduces complexity and potential security risks. How would you respond—what specific questions would you ask about correctness, threat model, observability, and maintainability?