Hi ! Hope you doing great !!
I read your requirement above, that needs a Windows app that will read data coming from RFI card reader and store it to SQL, process the data with Jason parsing and upload to a given web service.
I will deliver you Reliable, Stable, Optimized Solution for above requirement, I have 10+ years of experience in .NET, C# Programming, JavaScript, Microsoft SQL Server, Biometrics, Local Area Networking, WinForms, WPF etc.
It will my pleasure if you takes a look on my profile page and sends me a message in chat box to discuss and proceed it.
With Regards
Maroof K