ExpressVPN Senior Test Engineer interview questions

HR reached out for a basic HR discussion asking salary and other expectations and then scheduled a technical interview~90 mins with the QA manager. The tech interview happened in three parts: coding test, framework designing questions and resume dig. The interviewer seemed impressed, and told me you'd get a feedback quite soon and what project interests you the most as we want to make sure we get you on the team that you benefit from as well. The interview questions were average, based around tooling used, coding question around strings, sorting, arrays. It went quite well and I expected a further discussion if not an offer. But, I got a generic rejection email after 4 days (only after following up). I asked for specific feedback because I actually wanted to identify my weak areas and the HR just went MIA after that, standard practice nowadays.