I have recently developed an web-POS for a multi-store grocery business that matches your requirement. If interested please do message me for the demo link.
It has Owner Module, Data Operator Module, Sales Desk Module and Super Admin Module.
I can customize the existing software or can build you a new application from scratch as per your needs.
I am a full stack developer with 5+ years of experience on Microsoft technologies.
I have hands-on-expertise on developing web applications and custom software with below mentioned technologies/tools.
MVC5,
Razor,
.NET
CSS,
JQuery,
BootStrap,
HTML5,
JavaScript,
AngularJS,
Visual Studio 2017,
SQL Server 2017,
SQL,
Web APIs.
Looking to work together in future.
Thanks.