I interviewed Beijing office and it took a whole day. Very very tired. Actually not many probability questions. They asked a lot about the courses listed in my CV. And they didn't care about my research at all.

An OA followed by a tech screening followed by a superday (consisting of three rounds of interviews with three different interviewers). Interview questions are related to algebra, algorithm, data structure, machine learning, brain teaser, finance knowledge, and a business case.