I had a first a discussion with the HR where they asked me questions about my current salary and current situation and they explained me about the interview process and the role I applied for. After the call I got a link to an online test with questions in statistics and maths. Already three weeks since I had the test and never got any feedback from them.

Written test followed by 5 online interviews on general maths, programming, statistics and machine learning. The questions are not straightforward but doable and they don't expect you to know everything. At a later-stage interview with managers they seem to be looking for what special knowledge and value you bring to the company.