I applied through an employee referral. The process took 3 weeks. I interviewed at Google (Mountain View, CA)
Interview
The phone interview lasted about 45 minutes. Covered a couple of recent roles on the resume, one analytical question (see below) and one long term business growth/competition scenario analysis.
The onsite interview lasted about 5 hours and as many interviews. Each interviewer asked analytical questions similar to those in the phone interview. All questions fit roughly these patterns - for fictitious product/scenario arrive at a formula and use it to provide a number for total size, speed etc.; prioritization exercise for desirable changes to an existing internet product or a new product.
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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.