Desktop Retail Billing Software

I need a standalone desktop application built specifically for a retail store that makes day-to-day billing fast, accurate, and easy to track. The core of the project is a robust billing module, but it must integrate tightly with real-time inventory management, a searchable customer database, and clear sales reports that can be filtered by date, product, or cashier.

You’re free to propose the tech stack you think is best for a desktop environment as long as it runs smoothly on standard Windows machines without requiring constant internet access. A clean, intuitive UI is essential—the cashiers should be able to learn it in minutes.

Deliverables
• Installable desktop application (EXE or MSI)
• Well-structured source code with inline comments
• Brief user guide covering setup, daily use, and backup/restore steps
• Demonstration data set so I can verify inventory, customer, and reporting features

Acceptance criteria
• Invoice creation completes in under three seconds on average hardware
• Inventory quantities update automatically with each sale and reflect correctly after restart
• Customer records can be added, edited, and searched without delay
• Sales reports export correctly to PDF and CSV

If you’ve built similar retail solutions before, share a quick summary or demo link so I can get a feel for your approach.