The interviewer was very cold and distant. He didn't seem interested at all. He promised me feedback before the weekend and only got the rejection email on Wednesday, without any sort of feedback. I still don't know what went wrong. It feels kind of a red flag. If the interview is this bad, the work environment surely can't be much better. I won't apply ever again for sure.

The interview process was straightforward: Initial call with recruiter to get a sense of the position and day-to-day responsibilities -> online test of general front end knowledge -> live coding interview with two members of the team. This is the portion of the interview in which I did not end up moving forward after.