A few weeks ago at Hack the North (UWaterloo), a few friends and I built exactly this.

We literally aggregated all of our company data from StackShare, only difference was that we parsed their resumes for the preferred languages/technologies instead of having them manually enter it.

Glad to see our idea had some validity!

Link for those curious: https://github.com/kshvmdn/find-me-a-job.