We were approached by Castle VAT Bureau with an existing application written in Microsoft Access which needed to be re-written in such a way that the system could be sold without the requirement that Microsoft Office also had to be installed.

The VATSys application was completely re-written from the ground up using C# and the .NET Framework v2, including all user interfaces and reports. The underlying database was completely resdesigned and implemented using non-Microsoft technologies.

Design patterns such as Model-View-Controller (MVC) and development practices such as Test Driven Development (TDD, from eXtreme Programming (XP)) were employed to ensure quality down to a source code level and for future proofing.