I got contacted by a recruiter. As a first step, I had a call with another recruiter. He was also asking technical questions, but it felt strange. (A bit like talking to a wall.) I was rejected with a generic message stating that I was not "aligned with the position". This is weird as it was inbound and based on my profile. No feedback, of course. Waste of time.

Very kind. The questions weren’t easy, but with knowledge of database configurations, concurrency, locks, and some practical experience, you are able to answer them clearly, confidently, and effectively overall. It was good time.