It's a pretty rigorous process involving several rounds of testing -- including a technical round, behavioural round, team dynamics round, and problem solving round. The interviewers who typically tend to be team members rotating are looking to gauge learning potential and an overall holistic approach to the kind of role they're applying for. Thematic understanding and clarity in terms of concepts is absolutely vital. The interviewee needs to be able to tie their professional experiences to the individual components of the thematic area they're applying for a job in.