SAP Principle Software Engineer interview questions

3 Rounds of technical interview, each one has one leetcode style question DSA based Tree and Greedy. 1st Java based Springboot questions, API optimizations and Custom HashMap Implementations, few SQL questions. 2nd Round was mostly Design problem of TinyUrl which I did. Class Diagram and Optimizations with it. 3rd Round again was purely technical. I did not make it to Manager round.