Allowing Signed-In users to post service jobs (and other users to claim them)

Does anyone know of a simple-ish way to allow signed-in users to post service jobs themselves, like hosting a service marketplace of sorts? And then "approve" the job as complete, which pays the job-completer but me (site-owner) takes a cut.

I am assuming this would require custom development but there are some close built-in plugins on SquareSpace that almost get there, like the "Donate" feature, which allows customization of fields upon submission and a custom $ amount to give, but submissions are only viewable by me the site owner submitted. 

This isn’t something that you can do with Squarespace, even with custom code.