There are definitely companies selling such projects (Daxtra comes to mind), but as Aline Lerner pointed out [1] the problem isn't matching as much as it is sourcing. IOW, you don't focus on conversion optimization if you don't have enough traffic.

I do recruiting and because I'm a developer, matching is pretty trivial. But most recruiters don't have any serious dev experience, so if they need to search through a big database of resumes, this could help. Assuming you don't factor in that resumes are largely worthless :-)

1. http://blog.alinelerner.com/building-a-product-in-the-techni...