Hello my friend, I am interested in doing this project for you. I have done many such projects using C#, and if you choose me I will do it using the same language. This won't really effect you unless you plan on modifying the code yourself, but please note that it will only run in a Windows environment.
I have used AddMeFast before, so it shouldn't be a problem. It depends on what you want to do of course! I will program your application in C# if that matters, meaning that it will only run on Windows.
I am available on Skype throughout the day and have pretty good English, so communication shouldn't be a problem. I am also a registered freelance programmer in my country with a VAT number, if that sort of thing effects you. Hope we get to work together and thanks for reading.