I was reached by a recruiter on LinkedIn. Then they sent a home assignment to complete in 3 days. After that, I had an on-site interview.

Home assignment was nice. I was asked to create a rock paper scissors game. They wanted good test coverage and good architecture. They wanted to see some software patterns. All of these made much sense to me and gave me a good impression of the company. I spent my weekend, worked hard, and created a very nice project, including a UI.

Unfortunately, my impression was the absolute opposite about the on-site interview. They didn't ask anything related to the assignment. Then, why did they give that assignment? They asked me about Java profilers, which command to execute to find CPU-consuming processes on Linux, how the garbage collector works, etc.

This was the worst recruitment setup I've ever seen...

Create a Rock Paper Scissors game.

How does the JVM garbage collector work?

How does HashMap work?