I applied through an employee referral. The process took 4 weeks. I interviewed at Bain & Company (Los Angeles, CA) in Oct 2016
Interview
First round: 2 back to back cases. Straightforward cases, but difficult 'vibe' and the interviewers went out of their way to stress-test (asking questions that made it seem like I'd given the wrong answer to ensure I could back up my reasoning). 2nd round was three back to back cases, everyone was very friendly, very minimal behavioral questions (take me through your resume, and some follow up questions about resume).
2 cases for R1. Pretty straightforward cases about revenue optimization opportunities. There was a little bit of market sizing but all data needed was given. No behaviorals asked in round 1 for me.
Interview questions [1]
Question 1
What office did you choose and why? Do you have competing offers?
2 rounds, 1st round 2 small cases, not very difficult , market entry cases.
2nd long case with a deck to read and prepare answers..45 mins to read, 15 mins to answer
Three rounds of interviews, generally 2 rounds in person or remote with live consultants. Each round involves a 2-3 case interviews each, which generally also include a set of behavioural questions.