I finished the first round interview of 30 minutes. They mainly asked about Docker, AWS, and Kubernetes. I got into their final rounds of superday. They gave me a super hard coding question on the super day but I nailed it. They also tested me on their codebase to made some modifications. I also finished it. A week later, I was rejected. The interviews weren't hard but I didn't know what I did wrong.

Interview process was smooth. First round is OA. Second is resume/technical interview. Third and last round is three rounds in a row. interviewers are all pretty nice. There's no feedback from the interview tho.