Spanning Full Stack Software Engineer interview questions

i was asked to come in for an on-site interview after applying online and doing a phone screen. Everything went well and so I was asked to do a take-home assignment which amounted to writing a small web application. I did so according to spec and even surpassed the requirements by using their tech stack and writing tests for 100% code coverage. I submitted this in a timely manner and received acknowledgement that it would be evaluated by their engineering team. Days went by and I checked in via email and with a handwritten thank you card addressed to my interviewer for having considered me, but I never got a response thereafter, not even to merely say that I was rejected or passed over for someone else.