Phone screening with recruiter followed by a take home assignment. They said the take home should be 3-4 hours but realistically it takes a good 20. There were multiple parts involved and file structure requirements. I put a lot of effort into the assignment only to get completely ghosted. Not even a boilerplate rejection email. I am fine with being ghosted after a recruiter call but at least have the decency to answer a follow up email when a candidate spent their entire week on a take home.

Questions vary based on interviewer. It seems they just come up with some technical questions on the fly. IMO, if you know your stuff regarding traditional data science you can answer most questions.