I applied through other source. I interviewed at Ergo Direkt Versicherung
Interview
If they dislike you, you can know everything and even a bit more, they will be unsatisfied.
It was clearly visible that not that is their concern. I won't ever know, what was their real concern; but the face of my recruiter has clearly shown, it was serious.
Interview questions [1]
Question 1
Docker, docker swarm. (At the time, the latter was not retired yet.)