Ask HN: I created an app prototype, how do I hire a great developer(on equity)?

There are a few public transit prediction apps for San Francisco out there, but I created a prototype that is easier to use and more intuitive than anything on the market. I showed the prototype to 20 people, friends and randoms waiting at bus stops, and almost everyone agreed that I have a killer concept, once person even quipped "Now I wont miss my bus while trying to find out when it comes". I also have a killer marketing strategy.

Since I am non-technical, I need to find a developer. Ideally, I would like to pay the developer in equity, because (1) it is less upfront cost, (2) increased motivation to do a great job and (3) updating and expanding the app is easier with a partner than a contractor.

I live in San Francisco. Where/how do I go about finding developers? What is a fair % of equity to give in exchange for no salary? What is a fair % of equity to give for a very small salary? It will be very hard to find a developer who can also do graphic design (I plan on contracting for that). If someone can do graphic design as well, how does that change things?

Thanks, Hess

P.S. If you or someone you know is interested, please send me a brief intro and your portfolio to hessinvesting@gmail.com.

P.P.S I created my prototype with http://keynotopia.com/ after I saw it on HN. Being non-technical, I couldn't have asked for better tools to build what I wanted to build.