ASP.NET / Web Services Expert to Interface with Payment Gateway

We're an IT firm actively looking for a C# expert who has strong sense of web services to develop a backend system that interfaces with a payment gateway. This position is contractual basis and pays well.

The project will consist of the following responsibilities:

• Develop AJAX enabled search for state entities
• Design responsive and intuitive user interfaces for the web using XHTML/CSS and both custom AJAX scripts as well as MS AJAX for ASP.Net library.
• Be involved in Analysis, Architect, Design, Development, Implementation of System
• Create workflow architecture serving users/terminals and processing high value transactions per month
• Pioneer the development of a breakthrough in workflow architecture replacing the old COM based system
• Developed test coverage and unit test cases using NUnit and NCover
• Interacted with creative director to have all changes needed in user interface
• Configure VeriFone terminals V-3740 and V-510
• Develop reports using Crystal Reports 10.0
• Develop customized content management system using C#, ASP.Net and SQL Server 2008
• Develop payment over phone with Microsoft Tellme (IVR)
• Write Test harness and execute load testing in order to test performance of application
• Contribute to the adoption of Adobe Flex for the front-end 
• Be involve in developing Win Forms using Visual Studio 2008 
• Fully utilize the WPF Libraries with Ribbon Control for Rich User Interface
• Develop WebPages using C# and ASP.Net and perform unit-testing and debugging of Web applications which run on various Web Browsers (e.g. IE, Firefox, Mozilla, Opera...).
• Develop documentation and procedures for support, installation and maintenance of existing Web application
• Interact with the quality assurance, customer support and operations technicians to troubleshoot all application level issues 
• Provid on-call support for critical systems, remotely diagnose problems with data center support group 
• Have experience in developing and running test scripts with Mercury Test Suite and Load Runner
• Provide security direction for web projects
• Develop web auditing/remediation team to address web security vulnerabilities
• Serve as architect for web services security
• Develop database security strategy
• Design and develop Split Transaction Settlement engine using Windows Services in C#