Hammer Prep interview questions

Started off with a very thorough job application with questions about your knowledge of the company, from there you went on to a video interview and then a final interview person interview with their front office staff and founder. This is where it got weird. The founder showed up to my interview in FLIP FLOPS. Yes, I am not joking! So unprofessional and off putting. He also continually asked me about my experience in high school, which was more than a decade ago as he could see from my resume. Overall, it was a very very strange vibe from him.