I applied through a recruiter. The process took 3 months. I interviewed at Google (Mountain View, CA) in Jan 2016
Interview
They are clear about the steps and length involved. The questions are hard and abstract. However, some of them get a bit too far fetched and makes me wonder if they aren't more in the brain teaser territory. It was only Product Managers interviewing with "case" type questions the entire time.
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Other Product Manager Interview Reviews for 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.