Wayve Tech Lead Manager interview questions

I was told that the process would be 6 interviews in total. The first interview was with HR, it was just a conversation to get to know the company and introduce myself. Second interview with head of robotics, also an introduction and got a good feeling about it. Third was domain interview and that was supper difficult. It was a friendly conversation but had a lot of PhD level questions. Overall I didn't feel confident I would pass. Forth was code review and it was ok, but was also not sure if I would pass. Fifth was systems interview and it was supper difficult. Didn't pass this phase.