Help with software architecture for semi-completed C# project

I have a class library that parses a variety of text files and makes calendar (iCal) entries from the data in the text files.

I have the library working for 2 of the 4 styles of text file and am starting to run into design problems that are a bit beyond my limited experience. I would like the code to be neat, DRY and follow some general coding patterns (Gang of Four Patterns).

I need someone with a c# architectural background who can take a look at the existing codebase, suggest changes and help implement refactorings to bring the code up to a more maintainable standard.

You will need exceptional knowledge of things like the strategy pattern, Inheritance, Single Responsibility Principle etc.

I will need to see examples of some of your refactorings before awarding this job.

Thanks for bidding!