Nice people, contacted by recruiter, had a chat.
Talked to different people in the teams that made sense - very positive feedback. Then they decided to remove 2 SRE positions - 1 of them was the team I wanted to join. They assigned me to a different SRE position.
Technical assessment at home and then talked it through with a developer. He stayed distant but polite. They told me that it's fine that I don't know Ruby and Go so well but I got the feeling that this was not the case.
I didn't receive an offer and tried to find out more. I never heard back and got no feedback at all.