Gave a design problem before the first interview and requested a solution recommendation. Had three rounds (with hiring manager, tech panel and then hiring manager's manager). It was a video interview. Most of the folks were standing and I was relaxed and sitting. Their tech panel did not ask any technical question (surprise) but overall I got rejected with a feedback that I may not be ready for their startup like environment. I wonder they like people to standup and pretend to be fast and mobile.