I am thinking the following username roles will be:
Manager. This role will be able to edit menus, schedules, and start customer version (the menu that customer will see).
Admin. This role will be able to adjust the theme of the restaurants UI and possible customize other UI features upon client request.
Employee. This role will be able to start the customer experience and check assigned floor area. Some other privileges may be assigned as app development progresses
*** clients are the restaurants that will use this app