I was contacted by a recruiter on LInkedin, did one initial screening phone interview which was mostly about my background and history. I did a second phone interview where I was asked hypothetical questions and had to show my working verbally, it seemed focused on estimating market size, but I think it was judged on problem solving methodology. I then did an on-site which was like an interview written by Charles Dickens, as I was visited by 5 different interviewers throughout the day. Mostly hypotheticals again in the on-site.