Your scale implies one set of skills, and there's certainly more than that! As two important ones; the ability and desire to learn, and the tools you already know.
I've worked with a lot of junior engineers who didn't know much, but were good at picking things up and moving with them. I've worked with a lot of senior engineers who knew lots of tools and theory, but weren't very good at picking up new things. (I've also worked with junior engineers who were terrible, and senior engineers who could pick up new things faster than me; it's a mix.)
To get hired, you need to convince the hiring manager you can do the job, can do it better than the next guy, and can do it at a price they're willing to pay. Right now, there's simply not enough developers who can do the job, so even if you're not great but still get the job done and don't seem awful to work with, the determining factor is "did someone else better apply?"