Diamond Foundry Engineer interview questions

I was contacted by a recruiter to schedule an interview with the manager. There was a 30 minute video interview with the hiring manager. I didn't make it past this round. The questions were quite technical (I wasn't prepared for that) and the interviewer wasn't very friendly and was quite cold. They also seemed disinterested in what I was saying and there was a lot of noise coming from their end of the call that they never fixed so it was difficult to hear them. I left the interview feeling like this would not be a very welcoming or supportive environment to work in. I was ghosted after this, and after reading other reviews I am not surprised about my experience.