Round 1: Coding Solved the problem with 2 followups. Interviewer review was unable to solve part 1. Had to hint multiple times. I was able to solve all the followups and 5 min were left. Round 2: System Design Did not do a great job but able to came up with design by discussing various concepts. In reality, I started with asking clarifying questions, discussion around estimates (asked interviewer, whether he is interested in it or not). Then, he told me not to focus on APIs and data models. Directly jump into HLD. Review was - after hearing the question candidate did jump directly into HLD. No clarifying questions asked. Needed discussion around APIs and data models (which he asked me to skip) Round 3: API Good review