I got a employee referral. I did two on-site interviews with two Heads of Operations (one of them my boss's boss), then a pre-recorded interview with the HR team. The on-site interviews were part case interview, part personal interview. If you've done any case interview training, the cases are actually very standard, but they tend to be about more tech-oriented companies and highly measurement-based. I did both in a mix of English and Spanish. The pre-recorded interview I did with HR was pretty standard. This was completely in Spanish. To succeed any stage of the interview, you truly need to be passionate about the mission, have the right cultural fit, and show a track record of being very hands on. This is no place for classic consultants or financial analysts.