I entered the process via a recruiter I'd worked with previously.

I started with a phone screen that went well -- some simple puzzle questions that were easy to work out on the fly.

From there, I moved on to the on-site interview. This was a series of 4-5 one-on-one interviews with engineers who posed various technical problems, such as whiteboard coding and design problems. I found the questions moderately challenging, but none were killers. I'm pretty sure there was a "culture fit" session in there somewhere, too.

I didn't like what I sensed of the interviewers' attitudes. Most of them seemed more interested in showing how smart they were than in hearing from me. It hinted at a lack of confidence and a work atmosphere with some unhealthy internal politics and competition.

I recall that the questions were moderately challenging, but not killers by any means.