Hello,
I just went through your project details and would be glad if you'd allow me use my expertise work on your project. Talking about a perfect match, I have experience in scanning and generating of Barcode and QRcode using Xamarin Android.
If need be, I can show you a recent app I have completed which scans a QRcode and Barcode using Xamarin Android.
I shall await your response
Cheers,
Deborah