Was pulled in to interview by external recruiter, expressed that I wasn't sure but encouraged to go through process to learn, and then when there was asked continually why I wanted to work at google. Recruiter then told me that the panel thought I was a great candidate but I wasn't excited enough about google...
Very self-driven, first of multiple rounds, where I had to take the initiative to arrive at the problem, constraints, approach, solutions, tradeoffs and reasoning behind it in a matter of 30 minutes.
You would have to do a hiring assessment first, then a recruiter screening follows. First round interview with the hiring manager. Majorly product sense and product improvement. The questions were not direct though.
Overall a lot of steps to the interview process. Talked to different people and had opportunities to ask questions. Many different stages which made it a lengthy process overall. Wasn't too bad.