Depends on your role, expertise, experience and scope that you are applying for, they will then determine how many stages, how many rounds, how many interviewers are required for the interview process.

There are generally three rounds of interview with final round with MD or equivalent generally. Difficulty level of the interview varies but all three rounds are technical in nature. Sometimes there could be two rounds only with third being HR

One with hiring manager One with direct peers One with panel of team members One with department head Including one case study - describing processes of reaching to the conclusion of the case study Very slow process overall