I had OA and directly went for final round of interview which was virtual/on-site interview.
-1st round:
LP questions
design a Vending machine
-2nd round
LP questions
Design Tiny URL
-3rd round
LP questions
design a library for UNIX file search
-4th round
LP questions
gave a directed graph as different part of a program, asked to provide an order of compile
Honestly, I don’t like the way Amazon interviews. It’s not fair and based on luck, I'm a very good software engineer and I aced my LP questions and system designed and I was medium on coding sections, still got rejected with no feedback.
Unfortunately, the recruiter I was working with wasn't helpful at all.