Build a Website and acompanying app

I am looking to develop a website like freelancer that facilitates crowd sourcing. It will be to a specific group of people in a specific industry. I am looking for a developer who will be able to scope the project and then provide a price to execute it. In your proposal please provide references of what you have done in this regard in the past. experience is crucial. Please do not send generic replies but read the scope and send a personal response qualify why you should be doing the work. Only respond if you are willing to provide a basic scope document of what you will do before you are awarded the project. Thanks