Exactly as published on their "open Sourced interview process" GitHub repo.

Except I didn't have any take-home questions, just 4 video interviews in the format of coding, system design, coding and another system design.

Overall I really enjoyed my experience interviewing as the recruiter was super responsive and answered all the questions I could throw at them, and the interviewers seemed like truly world class developers, and asked me a number of technically challenging questions particularly during the system design interviews, which is what persuaded me to take this offer over others.

The coding problems were all LeetCode medium difficulty problems relevant to their product (CockroachDB), but I got asked some insightful and more challenging follow-up questions that I really enjoyed.

The system design interviews are really where the difficulty is, as they ask questions that can seriously probe your knowledge and designs.