While it's true that founders won't take money from just anyone, I actually think a software engineer with experience in the industry would be a great investor.

While it's true that founders won't take money from just anyone, I actually think a software engineer with experience in the industry would be a great investor. They can give you insight on tech problems/scaling, help with hiring, offer connections, etc. (Basically, most of the things you're looking for from investors besides money.) A software engineer investing in your company is pretty different than your real estate mogul uncle trying to get in.