Followed employee referral. First did technical phone screen with hiring manager, this consisted of discussion of background potential work once in the position and scheduling optimization question. Brought in to interview with two groups, this was done over 3/4 of a day in a series of two person team sessions with a break for lunch with the managers from both groups Questions included fundamental computer science including networking, algorithm design, and threading and race condition prevention in addition to optimal scheduling though experiment. Discovered afterwards that this question just appeared in the Huffington Post article "15 Ridiculously Hard Job Interview Questions From Top Employers Like Google, Goldman Sachs."