They took 2 rounds- first round had 2 leetcode medium questions (1 was string manipulation, one was DP) second round had one hard problem (make dequeue without queue data type), and then follow ups on resume

The interview process was fine. I went through 4 technical rounds. 1. DSA / Problem Solving, where they asked easy-medium leetcode question along with questions from previous experience. 2,3,4. They were all system design. That ranged from designing a microservices (LLD sort of), infrastructure, deployment, security, scalability etc. Every interview tackled different aspect of system design. All of them went well, got good vibes of selection from all rounds. Unfortunately didn't get selected and I am not given any reason / proper feedback.