HR had contacted directly and did an initial phone screening by asking questions related to Cyber security and related experience in application security domain. They were quick to schedule the interviews within 2-3 days. First round was an HLD/LLD round. The interviewer gave clues and was helpful but he always wanted to hear the answer which he had already thought through. He was not ready to accept anything except that. The answers provided by me may NOT be fully correct but system design answers aren't supposed to be 100% accurate. There can be multiple ways to design the same system. So, I feel interviewers need to be more open minded while conducting system design rounds.