Sir,
I have read your project descrtiption and see that you would like to create an application to be used by your counter staff, where they can enter details of items purchased and provide a receipt to the customer. The system also need to capture the time the operator logged in and logged out.
I am able to create for you a desktop application, or a web based solution that you would use internally within your company. This application would be created using Visual Studio and use the latest .net framework. The application will allow the operator to key in details, or alternatively it can also support barcode readers. The backend database would be created using SQL server.
I would be useful to chat further about your project to understand more about your product and how we build a system to work perfectly and make your staff more productive.
I look forward to hearing from you
Damian