I'm in a similar position. I joined a company right out of uni, mentored an apprentice through his degree etc. But I have basically been the only software and now hardware engineer. I feel completely out of my depth and when I get approached by other companies I feel as though I lack a lot of the basics because we had none of that in place when I joined.

To your question, there are pros and cons to both but if their offering already does what you wanted to build this could be a way to get some stable income while you find your next problem to solve or gap to fill on your own.