One interview. Was asked about 20 questions from a list the 3 interviews had in front of me. Gave you time to ask any questions in the middle of the interview and at the end. Was about 45 minutes or so. It was relatively casual for an interview, but still serious.

Interview process was a great experience - the people I met were very welcoming and nice and made the interview feel more like a conversation. No technical questions, more of a personality based interview.