There is a big tech out there, hidden from most of us.
Let's name it manufacturing (I'm not a native English speaker, so may be there is a better word).
I've been working as a tech for more than 20 years and I've never seen such kind of jobs postings, never!
There are a lot of factories producing machines, which does for example a pack for your milk or
print a circuit board for your refrigerator or whatever. And I'm pretty sure they need tech guys
to code all these stuff. Moreover, they need guys who will support the supply chain including
general front-end, backend, QA specialists.
This is a big industry though I've never seen jobs from they. Why? Do they use another not
so fancy tech stack or may be they've had another hiring and working culture.
Just curious.
Supporting the supply chain is different. I'm sure there's a term for this area. (ERP, maybe? Does that fit?) I think a lot of this is Java coding, with (often) SQL on the back end. Again, though, the dairy or whatever doesn't usually write that software. They buy it, either from an ERP vendor or a consultancy. And again, yes, those jobs do appear, though perhaps using different words than you are expecting.