The first part of the interview was a quick screening with a recruiter, who asked some simple technical questions.

The second part was a live coding exercise with a software engineer. I was required to write a LoadBalancer.

I did write the balancer (very well in my opinion), however, I discovered a flaw in my code: it was not thread-safe. I found the flaw and fixed it. However, the interviewer seemed quite disappointed that I made the mistake in the first place.

I can't really tell, as he was very quiet during the whole interview, gave zero feedback, and even seemed annoyed when I asked him a question.

I received a rejection afterward, again with no feedback.

So, my advice is to focus a lot on multithreading, as it seems a simple mistake there is a dealbreaker.

SOLID principles, multithreading, database transactions