Mobile development

I need you to develop roubust and customized Point of Sale Sysytem for most of business verticals. I would like this software to be [login to view URL] should have customized dashboard, reporting, back up feature, inventory management, taxes structure, employee time tracking, barcode scanning, different roles and authorities like managers, assistant managers and employees etc. You or your team should have built 3 full PoS sysytem for Retail, Restaurants