I know I am a very qualified candidate for any of these positions, and I have lots of GitHub contributions where people can actually see my work. That doesn't seem to be enough, however. Can't I just talk to a real person? My communication skills are excellent, and whenever I have gotten in front of the hiring manager, it nearly always leads to an offer. Am I the victim of algorithm-driven hiring?
To plug myself a bit: If anyone is looking for an experienced .NET architect who's done a bit of everything (including my own startup), drop me a line. I favor working remotely but I'll relocate to a desirable area for the right position. [nathan] at aldenfamily |dot| net.
Oh, and OP, you didn't mention if your question applies to you, but if it does, hang in there. We don't have much control over the ridiculous state of hiring in IT, so there's not much we can do except plug along.