Efficient. They start with key stakeholders to avoid wasting anyone else's time. The interviews are conversational but this is by design. They are each exploring your skillset with technical questions, and at the same time, assessing your personality and if you're a culture fit.
The case study process is very much to see 'how you think' and does not feel like a dealbreaker, which I appreciated. Skills assessments can be nerve wracking!
Additionally, being in talent acquisition, one thing I really appreciated was when the interviewers voiced their approval directly to me at the end of the interview - it gave me a real boost of confidence, and I want to bring this to my approach when interviewing candidates in the future.