Microsoft's interview process varies heavily depending on the org you are interviewing for (Azure vs. Office vs. Xbox). However, the core structure of the onsite loop remains consistent.

The Loop Structure

A typical onsite consists of 4 to 5 rounds, often back-to-back.

  • Coding (2-3 rounds): Standard Data Structures and Algorithms. Microsoft leans heavily on Strings, Arrays, Linked Lists, and Trees.
  • System Design (1 round): Standard distributed systems design. For Azure roles, this will be much deeper.
  • The "As Appropriate" (AA) Round (1 round): The final round, usually with a Principal Engineer or Hiring Manager. This is the deciding round.

The "As Appropriate" (AA) Round

This round is unique to Microsoft. It is called "As Appropriate" because the interviewer will adapt the questions based on the feedback from the previous rounds. If you struggled with System Design earlier, expect another System Design question. If they want to test your cultural fit, expect deep behavioral questions.

Recent Trend (2023-2024): Candidates report that the AA round is increasingly focusing on past project deep-dives, emphasizing trade-off discussions and architectural decisions you made.

How to win the AA round: Be honest about your previous rounds. If the AA interviewer asks how your first coding round went, and you know you messed up a boundary condition, say so. "I got the O(N) solution, but looking back, I missed an edge case on the while loop." They value self-awareness.

System Design at Microsoft

While AWS might want to talk about DynamoDB, Microsoft interviewers naturally gravitate towards Azure-like architectures. Understanding the equivalents (Cosmos DB, Azure Service Bus) isn't strictly required, but it helps.

Focus on:

  • Object-Oriented Design (OOD): Microsoft sometimes replaces a distributed system design round with an OOD round (e.g., "Design a Parking Lot" or "Design a Chess Game"). Brush up on your design patterns (Factory, Singleton, Observer).
  • Database Constraints: They will drill into SQL vs NoSQL trade-offs, indexing strategies, and normalization.

Microsoft Interview Questions by Round

Microsoft Coding Round Questions

Microsoft coding rounds favor classic data structures. Common patterns:

  • "Reverse a linked list in groups of K." (Linked List manipulation — a Microsoft classic)
  • "Find the LCA (Lowest Common Ancestor) of two nodes in a binary tree." (Tree traversal)
  • "Given a string, find the longest substring without repeating characters." (Sliding window)
  • "Merge K sorted linked lists." (Heap / priority queue)

Microsoft-specific tip: Unlike Google, Microsoft interviewers often ask follow-up questions: "Now make it thread-safe." or "How would this change if the input doesn't fit in memory?" Be ready to extend your solution.

Microsoft Object-Oriented Design (OOD) Questions

Microsoft is one of the few companies that regularly asks OOD instead of distributed system design. Common prompts:

  • "Design a parking lot system" — Classes: ParkingLot, Level, Spot (Compact/Large/Handicapped), Vehicle, Ticket. Discuss the Strategy pattern for pricing.
  • "Design a library management system" — Focus on reservation handling, fine calculation, and the Observer pattern for due-date notifications.
  • "Design an elevator system" — Discuss the Scheduler (SCAN algorithm), request queuing, and state machines for elevator states (Moving, Idle, Maintenance).

For distributed system design questions (common for Azure roles), see our System Design Playbook. For mid-level expectations, see the SDE-2 Interview Prep guide.

Microsoft "As Appropriate" (AA) Round Questions

  • "Walk me through the project you're most proud of. What would you do differently?"
  • "How do you handle disagreements with your team about technical decisions?"
  • "If I talked to your current manager, what would they say is your biggest area for growth?"

The AA round is adaptive — expect it to probe whichever area you were weakest on earlier. Prepare using the STAR-L framework.

Free Prep Resources

Related Resources: