The closest site to what you're talking about is ooomf.com (They don't have reviews, though) I'm building a site (CodeDoor) which uses open source contribution

The closest site to what you're talking about is ooomf.com (They don't have reviews, though) I'm building a site (CodeDoor) which uses open source contributions as the sole barrier to entry- a nice thing about that is that it self-selects for technical clients.