Those are the requirements for the app:
Add product and store
verify store owner
store can add its own offer on app
add photo of product
best deal / trending menu
QR scan for confirming purchase (or better technology to be used)
login with facebook
login with phone number/email
share to facebook (and other)
geolocation (to find nearest store)
(more details to be talked about)
I can offer complete layout design example in high quality.
Designer would also be responsible for the logo and Icon
Code must be open for new features.