I had interned at Microsoft over the previous summer, so I skipped the phone screens and went straight to the in-person interviews.

I flew out to Redmond for a one-day loop with 6 interviews, including one over lunch. Half were with one product team and half were with another.

The last interview of the day was with the "as ap" – this is the Microsoft term for the interviewer who is looking more for cultural fit and less for any specific skills/knowledge.

Given some synchronization primitives, implement a multiple-reader, single-writer lock. I was given the choice of using a primitive semaphore, monitor, or mutex.