Although the wording on our landing page (https://codeable.io) may be slightly off, this is exactly what we are after. We hand-pick and invite high quality freelancers to work through us, there is no bidding and they all have clear guidelines about pricing ($35 - $70 per hour, depending on complexity).

We are focused on WordPress for now, but long term plans to venture into other CMSs, frameworks and languages also exist.