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It exists all over the place. Small and medium businesses all over the country use old legacy systems that need to be upgraded and maintained. The hourly rates are insane for this kind of work, because it's work no one else wants to do. I had a friend who made an incredible living for himself just maintaining old programs written in COBOL, or re-writing small custom applications in Python or some other modern language so they could upgrade their OS.

Everyone wants the "cool" job building websites and consumer facing apps in Rails and Node, and so they all compete for those $120k developer jobs here in San Francisco. No one is competing to add a new input line to an old COBOL program at a factory outside of Detroit that actually makes something.

San Francisco and New York are where people to go to write software for the internet, and internet connected things, but most software running today that powers small industry and manufacturing, at least in the US, is old and disconnected. Maybe they manufacture soap or water bottles, who knows. Pretty much any small company that has "Since 19xx" anywhere near their logo is probably in need of help somewhere. I used to work in an industrial park with no less than two dozen of these kinds of companies. Not once did a software engineer, or firm, or anyone drop in, and yet I know that pretty much every business there had an aging system in need if upgrades or repair. Some move to turnkey solutions, but most need something a little custom because they have custom machinery somewhere in the building.