I had a total of 4 rounds of coding and 2 system design rounds.

I struggled with 1 coding round. I wrote the solution, but it didn't pass all the test cases. I guess it was considered a failure, which I can understand.

They conducted an additional round of coding, and I solved the problem, even with the follow-up question.

Rivian decided to give me a down-level offer, which was 50% of the salary I was getting from one of the FAANG companies.

This was very disappointing.

The recruiter told me their bar is so high (but not the salary), and I am not good enough for a senior role.

Design a social media system, something like Twitter.