Windows Billing and Inventory App

I’m looking to have a clean, lightweight desktop application built exclusively for Windows that lets my team handle day-to-day invoicing while keeping a constant eye on stock levels. The billing side should make it effortless to create and print professional invoices, apply taxes or discounts, and keep customer records tidy. On the inventory side, I need real-time tracking of incoming and outgoing items, low-stock alerts, and simple product search so we always know what’s on-hand before we promise anything to a customer.

A familiar Windows-native look and feel is important—something that runs smoothly on Windows 10 and 11 without extra installs. I’m open to your preferred tech stack (.NET/WPF, Electron, JavaFX, or another approach) as long as the final build is stable, secure, and easy for a non-technical user to install.

Deliverables
• Installer (EXE or MSI) ready for Windows
• Fully commented source code
• Brief user guide and setup notes

Once invoicing, billing, and inventory tracking are rock-solid, I may expand to sales reporting, so designing the data layer with that in mind will be a bonus. Let me know what framework you recommend, any similar work you’ve done, and the estimated timeline to get a working prototype on my desk.