Hello, I have built portals like this for companies such as CVS Health and FireFly Search and Giant Electric and JDL Electric.
My current bid and timeframe is for a basic site with the following functionality:
Complete user management system
Integration into Existing Software (Assuming access to sourcecode provided by employer)
Ability to function offline if internet access is disrupted (Service - Oriented - Architecture)
Real-Time Reporting for sales and room statuses.
(I need more clarification on "Integration through websites")
Mobile-Friendly site
Optional features:
Android Support - (about 10,000 INR, depending on features, as a mobile app)
This price assumes a service-oriented architecture using .Net web services and an existing database to connect to.