On Upwork.

I know marketplaces are seen negatively by many here on HN. But I think this approach to work makes total sense.

It is just the most logical thing on multiple levels. First, a structured database of supply and demand. Of freelancers with all their skills and of jobs with all their attributes. Second, to have a standard way to collaborate. All invoices look the same, all reporting looks the same. Makes collaboration so much smoother. Starting a contract is a click. Work gets invoiced automatically. Invoices get paid automatically.