Build application for facebook with permission to post in wall

Hi i need a programmer that can build an application for facebook. The user click on my link in a facebook page, then must see the popup for accept the app in faceboook and if accept all permission can procede to my website. If dont accept come back to facebook.com. I need very fast. I know that is not difficult. Please request just serious freelancer. I pay at finish work when the app is upload in my website and in my facebook development. Thanks