Find technical events on meetup.com and see who is good.

Startup Digest also has listings for every city. Subscribe and go the edgy stuff.

One of the best ways is also join programmers in hackathons or startup weekend. You should enquire for the list of attendees before the event and message, and see if there's any fit. A weekend working on an app is like doing a mini startup.

Of course, you should have a solid web page somewhere showing what you want to build -- otherwise it's a hard sell for programmers