I am looking for an freelance app developer

I have an idea of an application suitable for both android and ios platforms which has the potential to become huge. All I am lacking is the technical background and expertise.All I want is to start working on that as soon as possible before someone else has the same idea and they start working on it before we do. I am looking for such developers who is willing to be apart of it and help me achieve my goal. I am willing to discuss my ideas with the interested individuals after proper signing of an Non-disclosure agreement.