App Design & Development

I am looking for a developer or a Team of developer to design a mobile app. We first will need design for Iphone-Ipad then will later develop the app for Iphone-Ipad, Android and web portal. The App will need a web portal at first accessible for few members with special membership so they can work on things such as deals, etc... Now looking for to start with the design with between 7-10 pages with beautiful attractive design. Please let know how long for the process starting from: -Design -Development for ( Mobile Iphone - Android - Website) If you have a portfolio let me know where i can see it. We can later discuss more in details about the project with the chosen candidate. Thanks Good luck