Two online tests. First one on Python at HackerRank with 3 quite simple tasks for 2 hours. Another one on maths/probability/statistics at internal platform. Test consists of two parts, a break between them is possible. Each task has limited time two solve, tasks in second part seemed way harder. Followed with invitation to a set of 3 interviews with researchers. Pleasant conversations, with tasks on algorithms and statistics.

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