There are many startups which do this (or at least similar) already. It's often referred to as "backend as a service" (BaaS). Some links below, but you'll find

There are many startups which do this (or at least similar) already. It's often referred to as "backend as a service" (BaaS). Some links below, but you'll find many more via Google. http://www.kinvey.com/ http://www.kinvey.com/ https://backendless.com/ https://backendless.com/ https://www.parse.com/ https://www.parse.com/ http://www.baasbox.com/ http://www.baasbox.com/