Side ish bonus: you're basically prepared to run a one man show or move into niche consulting (much much higher rates). You also get to set the quality standards/procedures going forward, which can be satisfying.

As a tangential bonus, I've accidentally converted my PhD research coworkers to strict git/markdown thanks mostly to typora (windows application). I showed one person what my work flow and version history look like for some internal documentation and now they do the same and convert to word/pdf as a last step. As far as I can tell, no one outside of the math/cs intersection has the patience for latex.

Source: in that boat.

Edit: In regards to market rates, that can be alleviated somewhat in follow up negotiations (6-12 months in or so). It's hard to convince someone what you're worth / what your value proposition is when they're not used to hiring software people. You need to demonstrate your business effect first, since they typically don't have a clear picture of it.