Write an Android application

We have a standalone Restaurant POS developed in-house in .NET technology. And now we require the Android based hand-held devices to communicate with our POS. Below mentioned are the functionalities to be handled by the application: 1. Secured Login for every user 2. Display all the tables according to their status from the SQL SERVER Database. Status can be assigned, joined, out-of-order and reserved. These values are preserved in the database. 3. Facility to join 2 tables , or reserve or make it out of order and check the same through the application. 4. Facility to check the assigned tables with number of person(s) 5. Facility to assign order on a particular table This should display Menu with search bar or code, qty should be editable. Facility to add notes with the order 6. Facility to cancel the order or order item. 7. Facility to generate KOT. 8. Facility to Pay the bill and release the table. Maintain log files, of all the actions according to the user is mandatory. Similar facility for Liquor, on a single table Food and Liquor both the items may be ordered. With liquor the quantity would be attached in ML / L / Bottle. Entire database design and logic flow is there. We only need the front-end Android application. Database design and the application mock would be provided by us. Also, please note that there should be auto-synchronization between the Standalone system and the Android applications. Also we would require the source code of the application. Kindly let us know the best estimate for the above requirement.