The overwhelming majority of real jobs are not related to these things you read about on Hacker News.
I help a local group with resume reviews and job search advice. A common theme is that junior devs really want to do work in these new frameworks, tools, libraries, or other trending topics they've been reading about, but discover that the job market is much more boring. The jobs working on those fun and new topics are few and far between, generally reserved for the few developers who are willing to sacrifice a lot to work on them or very senior developers who are preferred for those jobs.