Campus interview. Two technical/brainteaser questions, and then behavioral questions about the resume etc.

First round was a 1 hour on-campus interview. I was asked a few questions related to algorithms, probability, and statistics. The second round was an onsite interview at the Chicago office, which consisted of four separate 1-hour interviews: one behavioral, one programming, and two quantitative. I found the onsite interview slightly less difficult than the first round. interview, followed by an onsite interview at the Chicago office.