I applied online. The process took 2 weeks. I interviewed at Google (Seattle, WA) in Mar 2015
Interview
Phone interview mostly about my background and less hypotheticals, followed by 1/2-day onsite interview. The onsite consisted of three 45-minute interviews and lunch. The interviews were entirely hypotethical questions, nothing about my background or prior experience. Each interview consisted of 2-3 hypotheticals, sometimes building upon each other. The lunch was more casual and was an opportunity to interview the Google employee and not be interviewed myself - this helpful in providing insight into life at Google.
Interview questions [1]
Question 1
Estimate how you would have determined the required data storage when gmail was initially launched.
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.