Recruiter had reached out to me and I had a 1 on 1 with him. Next round was with the hiring manager. It involved 2 coding questions over the phone. I solved them but couldn't optimize them due to time pressure. I received rejection a few days later.

The question had nothing to do with the day to day job and my relevant experience along with my recommendation was totally ignored. I didn't even get a chance to ask questions to the hiring manager about the company.

Data structures and algorithm questions are things that you don't really use at work, and you can Google them if needed.