I had two tele phone interviews, a couple of weeks apart. Then I was invited for a series of on-site interviews. It took half a day and consisted of five 45-minute interviews, plus a lunch interview where I was shown around the office and got to sample the Google canteen!

I felt that the team didn't know what they wanted. After saying that experience and knowledge of "large scale systems" wasn't required it became the deciding factor in the decision. Technical interviews were fine, but often focused on one particular technical aspect. If you didn't have knowledge in that particular area the interview didn't go well. The process did allow for a re-take of an interview if it didn't give a good signal on the first time around. I would have preferred a clearer understanding of what the company actually wanted.