Barcode Invoice Tracking Website

I'm looking to develop a barcode-based invoice tracking website. The site should include:

- Real-time tracking of invoices using barcodes
- Automated notifications for key events (e.g., when an invoice is viewed or paid)
- Detailed reporting on tracking metrics

Ideal skills and experience:
- Web development (front-end and back-end)
- Experience with barcode integration
- Database management
- Familiarity with real-time tracking technologies
- Strong UI/UX design skills

Please provide samples of similar work.