The whole process took about 3 months with three stages. First stage was online interview with two of the data science team, which was some questions about the CV and other general questions. Second stage was a case study presentation which I was given one week to prepare and present it to 4 from the team. The last stage was a group assessment where each group consists of 5 candidates, it looks like the most important factor is that you need to engage and participate with team.