Delivery Mobile App for Android required for a new project

A kolkata based new company looking for a complete solution at lowest quote for a food+liquor delivery app. A perfect front end and backend required. We are not a broker or deal setter. We will ourselves maintain our own stock of goods and sell it. Hence, it is a B 2 C app. Seller location is fixed and buyer's location will vary. Many laws and constraints are to be looked upon. For now, the app will be for android and later on will be linked to ios and website too. Backend features: Upload and maintain new products Launch new promocodes and apply it Allow delivery-person to accept arrived orders Automatic billing of ordered products Expected time of Arrival, etc Order tracking (4 steps , i,e, 1. Order received, 2. Order picked up, 3. On the way and 4. Delivered) Feedback system Easily manage multiple order simultaneously. Front End features Beautiful and safe UI Location through Maps/ Enter Address Expected time of Arrival, etc Notifications Application of promocodes Automatic billing of ordered products Order tracking (4 steps , i,e, 1. Order received, 2. Order picked up, 3. On the way and 4. Delivered) Feedback system Login and linking Social media system (Login through facebook/gmail/etc) Call the driver feature and Basic elements of a delivery app Note: Live order tracking through gps not required. Customers need not see where the bike is.