The interview went well. A lot of questions about my background in order to check if I fit the position. There was a lot of time before the 2nd and 3rd interview and I wrote some e-mails inbetween where I got a reply. After the 3rd interview I waited for 3 weeks and then I got a reply that they have not decided about the position yet. Unfortunately, after this, I never heard back from the company and decided to check Glassdor for feedback before writing another reminder. I got the confirmation here that I will never get a feedback.