It's a tough ask because there are so many people looking for developers to work for free and not enough developers around to fill the paid jobs.

However, there are some people who if they love the idea might come on board, more likely as a side project.

To find tech co-founders have a look at the following sites:

https://www.cofounderslab.com/
https://www.founder2be.com/
http://www.founders-nation.com/

There are also meetups and networking events for founders to find tech co-founders try looking through www.meetup.com for ones local to you.