I applied through an employee referral. I interviewed at X (San Francisco, CA)
Interview
Entire process was really smooth. The recruiters were really on top of things (best out of all the companies I have applied to) and were prompt in responding to any questions that I had. I was pretty underqualified for the position, but still managed to get invited in for the standard 6 interviews. While that is definitely tiring, you end up meeting some really interesting, extremely smart people. They're the only company I hold no hard feelings towards because I felt that the entire process was really fair and well done.
Interview questions [1]
Question 1
The questions each interviewer asked were based on problems they were working on at the time, so your best bet is to find out what area each interviewer is in and try to review things in that field.