Grocery Selling Android App

50% Payment will be made after 50% work completion. Don't ask any amount in advance. Will not even create any milestone without checking your work on my project. I want that user account should be registered using our mobile number and our user id will be our own mobile number always. There should be login and logout option. User can open his account on other mobile using their mobile number and password also. There should be an option for Users to share any of our products on social media also. It will be a grocery selling Android App. It will be a grocery selling as well as marketing website. Where we will be listing the details of our registered merchants and customers can search any merchants by searching their Pincode and registered merchants will come on their screen. Source code will be our property. There will be user accounts, Merchant Account, Admin Panel. There will be Payment Gateway. There should be limited products. Will show u reference website from where idea can be taken. Database should be lightest and App should be very light. App should work on All kind of Android Mobiles. It should be bug free app.