Developers are in short supply and everyone has the next big thing and wants a developer to join them for free or an equity share. Finding developers is never easy but I planned to pay for them that way you get delivery on time and on budget (well if managed well). I have used Guru.com and elance.com before to hire freelance developers and designers so understood the process and how hit and miss it can be. This time I opted to use oDesk.com because I had worked with a few startups that had used it and found some great people via it.
My general advice is you seem to get good quality developers from Eastern Europe and developers from India & China are a bit more miss than hit. Because of this I filtered the people via location and invited a bunch of people who I thought based on their profile and example work could deliver what I was asking for. This process takes several weeks so don’t expect to signup on day 1 and have a team working for you on day 2. I needed an iOS developer then a backed developer who could write the API, database connect and do the scraping of car data I was going to need.
After a couple of weeks I had Yuriy from the Ukraine who was an iOS developer & Michael who was based in the UK and a php developer. I shared with them the FluidUI mock ups and a trello board with a list of features to be developed.