I applied online. The process took 4 weeks. I interviewed at Google (New York, NY) in Mar 2018
Interview
submission of application -> phone screen -> hangout interview -> onsite
I sensed that onsite interviews were all about checking on the chemistry between myself and the hiring manager (and his managerial colleagues from other teams).
It was all good, the interviewer was very nice. Technical questions were a bit challenging but overall it was good. The hiring manager was looking for some hands on experience
Back to back interview.
[1]. Mainly ask ML concepts, e.g., how to develop a classifer for youtube video; they will also ask some statistical concepts
[2] Coding for both python and sql
Applied at PhD level so I had two back to back technical interviews. One all stats concepts and the other talking over a hypothetical experiment design and walking through my thought process.