DP World Software Engineer II SDE2 interview questions

After clearing hacker rank. The F2F interview had questions from locking to index, procedure, microservice architecture, JWT token etc, cloning linked list which was a hard problem but with small hint I solved it perfectly. I also answered all the other questions correctly and interviewer didn't know that JWT uses base 64 kept saying does it not using hashing . In 2-3 hours they told rejected. They are a funny organisation, HR told he would call back but he didn't even pick up the call. The same HR created drama after 1st hackerrank test 1st saying I had cleared then writing I didn't clear and upon asking again told I cleared the round. These people are sorry people, just sitting in the high chair misusing their powers and getting a feel good from rejecting people, they are not there to hire, they want ego boost. PATHETIC INTERVIEW EXPERIENCE