Internal referral for the position. Process began with an initial phone interview with the team's recruiter, discussing background, interests, etc. After that had a one on one with the hiring manager and again met with the recruiter. Spent roughly 90 minutes with the hiring manager discussing the role, background, and how I might approach different problems. After the interview the hiring manager gave me a "take-home case" assignment to work on, send back, and discuss during the next round of interviews. It was a very abstract assignment but intended to see how one would go about distilling a wide range of data into concise actionable points. Was given 48 hours to do the assignment.
Next round of interviews consisted of an hour with another member of the team, going over the case presentation that I had sent back earlier. After that spent an hour on the phone with one other member of the team, this time discussing motivation for the role (as someone switching industries), etc. The last interview was on a Friday, offer was made the following Monday.