Data Store – This is Azure SQL server database. It has Users and Roles information and POS application information – Inventory, Customers, Employees.
Data Access Layer – This is implemented using Entity Framework. This Layer provides Entities using which Read / Write operations are performed.
Web API Service Layer – Since the data needs to be exposed to the web and to various clients, we need open standards for data communication. This is possible using JavaScript Object Notation (JSON).
UI Layer – This layer is implemented using AngularJS for Data Display and user interaction. AngularJS is a powerful JavaScript framework used for building Model-View-Controller (MVC) based applications. AngularJS is used creating View Model on the client side.