First,sent my CV to HR 1.written test 2.on site interview 3.phone interview all of them are brain teaser and probability. I thought I answered all of these questions. The hiring process was tooooooo long, I waited for about two or three months, they should know not anyone can waste time only for their special recruiting process, so I declined the offer when they come to find me. By the way, Salary is not attractive compared to other software company, if you want to grab some talent people, you should speed up your step and don't regard them as nothing.

Screening -> Online tests in math (many problems on a variety of topics) and programming (3 easy problems on data parsing and filling in gaps) -> 3 technical interviews (math, programming, and DS/finance), usually a few simple warm-up questions and 2 more difficult problems to test the depth of knowledge -> interviews with teams, talk about your experience, scientific work, then questions related to the specifics of the team you are applying for, you need to come up with hypotheses about the data -> rejection