There are 4 steps, first is cultural then 3 technical steps. Out of the 3, 2 are coding challenges. Then at the last step you are given a take home exam

It consists of 4 steps. 1. A phone interview with someone nice from human resources. 2. Algorithms test. A bit hard but ok. 3. Live coding with someone. ok. 4. Build a project. I was given an exercise to build for iOS, where the instructions clearly you could use X technology for the backend. The day of the interview I was told I wouldn't be able to work on servers if I used that. So I was sent back to repeat the whole project with very little time. I think it is a very automated project to get a lot of developers and see if someone hires them through toptal. Interviewer spoke a very broken english and was very problematic. Firmly believe it would have gotten a lot better if I got another interviewer. Everyone else were actually nice.