There was a two-part interview process: a written exam and an interview. I was afforded one or two hours (I don't remember the exact amount of time) to work on the exam, which was a mix of behavioral and technical questions. The technical questions were wide-ranging, from business-oriented questions to questions asking for executable code. The interview was entirely technical, in which the interviewer and I worked through a case study that required knowledge of statistical distributions and time-series.