Write an Android application

Hi, I want to start a security password application app on the Android OS and I would need a developer at around 20 hours per week to develop a prototype. The application shouldn't be too difficult to be built and we have a timeline of 1 month for creating it. Please note that the code will be maintained on our servers and any code needs to be transferred to us at the end of the project. The application project is on Android, if it is a success. We will try to move this on IOS, Blackberry and Windows OS. Objective for the first prototype: We want an application that will let you control which apps you want to be displayed when unlocking your phone. In order to do this, the application needs to let you create private profiles. Each profile will have a specific password with a defined set of apps that you will have selected in advanced when you have created your profile. For using the profile, you need to unlock the phone by putting the provided custom password instead of your usual android password. More information will be provided when developer will be chosen and the NDA is signed.