I applied through an employee referral. The process took 1 week. I interviewed at Alpine Data Labs (San Francisco, CA) in May 2016
Interview
I was contacted by email to schedule a call. They called on time. I talked to the lead tech in the department. He said after the call, there would be an on-site process that would take 4 hours, meeting with 4 different teams. After that, they would talk amongst themselves and make a decisions, without further process. (I didn't make it that far -- changing careers.)
Interview questions [1]
Question 1
They asked me to rate my experience with Linux, and were interested mostly in skills (over my experience not directly related to the tools.)