bug fixing app (appgyver steroids angular.js ionic cordova)

I need an expert of angular.js and appgyver steroids for my app called salonedigitale. This is the list of the known bugs Bugs known (both platforms iOS, Android): -When a user make the first login on the application the data are not saved into database. If the same user would close the app and than re-open it again, the data will correctly be saved on the database; -When a “user1” make the login within the app and then logout, a login of a "user2" would not work correctly becuase every update of the data would not be saved into the database. Bugs known(Android - tested on Android 4.2.2): All the problems are regarding photos (add/update/delete): -In the "Foto Salone" section, photos cannot be loaded and it’s also impossible to upload them (cordova-imagePicker plugin is used for multiple upload); -In the "Design" section user can't add/update/delete photo in "Copertina" tab; -In the "Staff" section, in the add or update action, most of times user can't add/update/delete photo. -In the "Staff" section, most of the time the app does not work when I delete a staff from the list or from the detail; - In the "Servizi" section, most of the time the app does not work when I delete a service from the list or from the detail If interested let me know that I will send you the app, the code and we'll set up a skype call to start with the job. I would like to start ASAP