I had two(ish) interviews: one phone and two (same day) interviews with team leads and program directors, respectively. Everyone was very friendly and helpful in the interview if you got a little lost. The thing that got me most was fatigue because I wasn't mentally prepared for nearly four hours of in person interview and problem solving. Outside of the length is was pretty standard.

Phone interview where we reviewed an Excel spreadsheet over google dox. Met in person a few weeks later for a more personal interview. The Excel was the toughest part for me. One must be proficient in Excel to get this job.