Friendly interviewer (hiring manager). I answered technical questions well but my German skills were not good enough to meet their expectations.
Suggestion for other foreign applicants like me: Should improve your German skills to have at least C1 level. B2 is not enough.
Interview questions [1]
Question 1
What do you know about BDR?
Tell me about your experience. What did you work with before? What are you good at? etc.