This was a lot to implement in 45-50 minutes. I used modern frontend patterns (React context + hooks, Typescript, flexbox) and was able to get *a lot* of the functionality in place. Time ran out just before I was able to use the hooks I had created to allow editing of calendar events. If there was anything the interviewer didn't like about my coding style, that was not communicated to me. So I presume the interview is a simple pass/fail based on whether you finish the specifications in time, which in my opinion is not the best way to judge someone's capabilities in a role. Maybe I was rejected for a different reason, but as stated earlier, they didn't provide any feedback, which was disappointing. Perhaps they're only hiring 10xers.