Hello, I am web and desktop application developer. I have read your job very carefully. I can work on hourly basis as well as fixed price. I would like to show you my portfolio and would like to work for you.
I think if you want to build an application for invoice only then I can use telerik so you can view your invoice as a reports also.
Skills : Asp.Net MVC, Vb.Net, WPF, CSS, JavaScript, JQuery, Telerik, Entity Framework, LINQ, SQL, API Development, Payment Integration
With your permission I would like to discuss more about your idea so I can start work asap.
Have a nice day
Thank you.