Optiver

HR -> OA -> phone -> two round final OA was a bit tedious. Phone was standard coding. Final was difficult: one system design with no coding and one technical.

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