Update Apps

I need an experienced developer with experience in PHP as well as Mobile App Development for iPhone, Android. I need to link databases to PHP web forms that allow for me to retrieve and handle data from my real-time database. I will need to have two abilities using this PHP form, I will need to create a master handler of data sets using a master linking form to assign one device master privilege over the data set of minor devices. The second ability this form needs to have will be to link multiple data sets together which will allow multiple devices to share nodes of children in the data. An additional feature will be to have drop down menus of current data handlers so we can choose correctly and avoid typos during this process. The ability to undo the linking of data sets will also be required for this project.