My experience was inline with what others have posted here.
5 Rounds
I am self-taught so I bombed round 5's C.S. concepts discussion. Feedback confirmed that with concerns over my fundamentals. I was rejected but was offered a position for non-software engineer but technical role, which I declined.
Tip:
Have a GREAT answer for "Why Tesla?" and generally just be super enthusiastic about the company. I got positive comments on this in multiple rounds.