Help.com Senior Software Engineer (Backend) interview questions

An external recruiter contacted me and sent my resume to Help.com. We scheduled the "screen interview". The call lasted for around 20-35 minutes. First we talked about my background, the interviewer told me about the company, the usual. Later the interviewer started asking very specifics on what they do (would not help a candidate to show his/her skills really, with this kind of questions). Also, about my experience with profiling database queries, performance and API design. This last question was the most useless question, in the entire interview, not because of the type of question, API design for a backend developer position is really valid but the interviewer made it sound there is only one way to do API design and only their way, he didn't like when I said I don't understand what he was asking and I did not want to answer because I felt his attitude was all about we do the best API design, tell me what I want to hear and it has to be my way, so I refused to answer, playing dumb. Knowing what my CV and my track record shows though is that I have built systems in the same area and I have done it other way which I think it's more scalable compared to what they are doing. I am glad they did not want to continue. Their only feedback was that I did not answer the API design question correctly given my experience, I mean just wow, but I leave it there, keep building a system with the wrong technology and re-inventing the wheel.