First I had a phone screen with a recruiter, then come on site for a technical interview. Then I came back for a full day with 4 technical interviews, an architecture discussion and a "previous work" discussion. Everyone I met was friendly and interesting. In general, I liked the interview process because the tech interviews revolved around actual problem solving, including compiling your own code, rather than focusing on algorithms and theory. The interviewers tell you what they expect from you up front (e.g. make it work but don't care about efficiency). The process lasted a long time because I was dragging it out while interviewing at other companies. The recruiters were very kind about letting me take my time and not pressuring me to move forward more quickly.