There was a phone screen followed by two in-person interviews. The phone screen was very informal - just an overview of the company and a description of the technologies used. The first in-person was a more typical interview, with the usual behavioral questions ("tell me about a time...") and inquiries about past projects and familiarity with different technologies, particularly those Microsoft-related. There was a bit of whiteboarding, but nothing too tough: fizzbuzz, reverse a string, palindrome test, etc. Final interview was a group interview with larger team, and more informal -- more of a meet-and-greet.