Rivian interview questions

i had total of 4 rounds of coding and 2 system designs i struggled with 1 coding round, i wrote the solution but it didn't pass all the test cases, i guess it was considered as failure, which i can understand they conducted additional round of coding and i solved the problem even with the follow up question. Rivian decided to give me down level offer which is 50% of the salary that i was getting from one of faang company. very disappointing. Recruiter told me their bar is so high (but not the salary) and i am not good enough for senior role.