There were 5 rounds of interviews, for finally being told it can be either for senior or staff level. I would have appreciated clarity at the beginning.

Recruiter Hiring manager ML theory ML system design Coding 90min

Theory on Transformers and the difference/similarities with RNN.

System design to identify NSFW social media posts.

Coding - take home code base to familiarise yourself with the problem, expected to redo everything from scratch during 45min (key concepts are asyncio, unit test, embeddings) enjoyable exercise, but no time to think, you are expected to be a team member that uses this daily so can write and test code quickly.