Restaurant service

This is part of my E-commerce project, which consisted of several stages, such as:
SMART
User Portrait
Impact mapping
Technical requirement
Information architecture
User flow
Prototypes, design
Landing Page layout html5 / css3

A task:
Creating a universal platform to replace accounting programs and the entire front and back office, available online in real time without the need to import implementations and export menus while maintaining corporate security
information.