I have done subcontract work for a crowd funding site before, unfortunately I can't give you the URL because the client believes that it was done by some other "web design" company near him. The work was however farmed out to me.
I am very familiar with not only the crows funding concept, but PHP / MYSQL in general.
I have passed a bunch of knowledge exams here on freelancer and have badges / awards on my profile to prove it. I also have nothing but great reviews, a high completion rate which means I wont take a job that I can't finish, and I have a high repeat client and ontime percentage. If you look at my stats, it's much better than most other freelancers.
Here's the best part: I am in the US so communication between us will flow more easily.