Recruiter call, Pitch call where they give you a tour of the product, 1 medium/hard LeetCode interview, 2 system design interviews (1 for general architecture and 1 more focused on scale), behavioral interview, and a "Practical Coding" interview. Recruiters were very responsive and moved me through the process faster than any other company I was interviewing with. Technical rounds start easy and get progressively more difficult as you are able to answer things. The practical coding round was pretty open-ended, kind of like a system design round but translated that into reasonably functional code.

Sliding window functions are typical system design questions. "How to do 'X' efficiently when you are dealing with billions of records?" STAR format behavioral questions.