Microsoft Senior Software Developer Engineer interview questions

I went through a phone screen which consisted of LC med and LC hard, the next step was the interview, the first interviewer asked 4-5 LC questions in quick succession, ranging from Med to hard, for some I had to write the code, others they just wanted to check for the approach. I was asked system design questions on finding the bottlenecks in a system with a given parameters and had to come up with a solution to mitigate the answers

It's got initiated with a couple of calls from a technical recruiter, this was an opening for SAP GTS. During an interview, I had given almost all the answers correct, the interviewer was at the same designation for which I have been interviewing for, I realised the Question was not at the level I was expecting maybe the person who interviewing is not skilled up in the level he is supposed to take an interview and guess what he rejected me where I answered all most all answers right. I still wondering why I got rejected, just a suggestion to recruiting team don't put a panel of the same designation for which you are recruiting it creates a conflict of interest and maybe a bit of insecurity while taking the decision.