Four hour interview, six interviewers switching off, followed by an office campus tour. They gave an agenda at the beginning of the interview and put me in a conference room. I was there all morning, with the interviewers shuffling in and out.

First there were two phone interviews, one with HR recruiter and one with an engineer. For the in-person portion in the office, I was stationed in conference room; multiple interviewers rotated in. Short tour of the facility later. They are now located in a different town.