I would describe the entire process as quite corporate for a start-up or scale-up. While the interviews were generally polite and civil, they were quite distant and not especially interested. Although there were plenty of opportunities for the interviewers to ask in-depth questions, the approach seemed to be to ask questions where they were waiting for a "keyword" type answer, which I didn't think was the best use of everybody's time.

They seemed to have a checklist of questions and didn't really use the opportunity of follow-up questions to have interesting discussions. They claim to be agnostic to the tech stack, but in reality, I found all the interviewers to be quite Go-oriented, so expect multithreaded concurrency discussions. The system design was quite intimidating. Despite claiming to be collaborative, the atmosphere was serious and intense, and I would say there was more grilling than there was collaboration.

Design a real-time event processing system.