The interview process consisted of two phone interviews and then an on-site interview. The first phone interview was an algorithms-based one and the second one was a coding-one. Both interviews had some questions ranging from medium to hard difficulty. The coding one was especially stressful as the questions were not trivial (reverse a list, find duplicates, etc) but were still algorithmically somewhat interesting. The on-site interview was intense. I was driven in a limo over to the Palo Alto site, and it consisted of breakfast, 2 interviews, lunch, 3 more interviews, founders interview, and then dinner. People usually stay for dinner but I had another event planned that night so I skipped out on the dinner. All interview questions are tough. Most of the questions I had to ask for help/hints to get the answer. I still ended up getting the offer though :) Also, this place is like an interview slaughterhouse. When I was there, I estimate they interviewed 20-30 people that day, and it seems like they interview that many people onsite at least 3 days a week.