Accounting Software development on already existing program

I have a contact management program and accounting software program designed for the tutoring industry. My programmer left and I want someone to make a few significant upgrades so I can market it. It works great right now, but lacks a couple of things more accounting related than CRM related. This is the front end website: <[login to view URL]> **Requirements: ** -Visual Studio 2008 / .NET 3.5 -SQL Server 2005 - solid SQL coding and stored procedures -Able to interpret existing code quickly and know how to correct, improve or enhance it. -Basic IT tasks such as working with Windows 2003, IIS, SQL Server configuration and basic server maintenance tasks **Optional (Nice-to-have)** -Visual Studio 2010 / .NET 4 -Visual WebGui version 6.3 or 6.4 -my program uses 6.3, staging uses 6.4) -Basic accounting knowledge