Zen Cart Back Office Modification to allow POS function

Hi, I am looking for a freelancer to create a module for the back office of my zen cart website. Situtaion: We are trading both online and offline but we have problem connecting the data from offline to the online system We are looking for someone who can: 1) Create a Point of sales module at the zen cart back office for retail use at the shop front (simple bar code will be used) 2)This point of sales system will deduct stock level using the same database as the zen cart website 3)ability to add customer detail from the point of sales module and we can seperate customer who comes from internet or off line. 4)Allow different tax rate and discount level in the POS module 5) A report module that will list number of orders and total value which seperate sales from POS or online (include customer name, POS or online, order value and order total of the day)