1. Call with the recruiter about Mistral, candidate motivations, and some elements of behavioural questions about past roles.
2. Coding interview - LeetCode style. Starts with a simple task, progressively made more difficult / with extra optimisations. Progressed to final part with optimisation, proposed a good optimisation but implemented it only partially correctly.
3. System design - design a scalable AI system. Interviewer seemed quite opinionated and didn't seem to appreciate a solution he didn't pre-emptively have in mind. I had a feeling I would be failed 5 minutes into the interview.

Overall, I think the 1st and 2nd round interviewers were reasonable and personable, while the experience with the 3rd round interviewer was rather bad. So to sum up, I would rate the whole process as neutral.