

I would interpret that as in-house.
To get a pay bump you’re probably going to want to be looking at Frontend Engineer roles in a tech/SAAS company. Skim through some job descriptions for those to see what is in demand. (React is probably involved.)
(I haven’t been paying attention to news.)
But if power is out I could see some traffic lights eventually failing to work, at which point I might guess the driver/organization sees it as a liability to continue the routes. So, I don’t know if the payment system would be the limitation.