a video interview and a home task which covered so many different topics (they expected me to work a few days on this home task). I submitted it and was invited to a follow-up interview on-site. I was rejected and they never bothered to take 10 min. and to explain what I did wrong.

They asked me to send my CV. After that I had a small meeting with HR about me and the company's history and interests. Lastly, I had a technical interview with a task to do.