Optiver

First of all, you have to do an online test. Based on the results, you then go through two more interviews: one with HR and one with the hiring manager (an engineer).

A challenging C++ problem to solve. It was not something an ordinary developer could solve, and it was one I wish I had studied more for. Afterwards, I did not get an interview and received no feedback.

Applied online. Had a short behavioral phone interview, followed by a HackerRank test. I didn't pass all the test cases on the third question and was rejected shortly after submitting my test. The phone interview seems to be just a formality; moving