Hello,
I'm working on different UI applications past 8 years. Applications were built using C++, MFC and ATL/WTL libraries. So my experience covered different aspects of UI interactions: work with databases, integration with different libraries and online services.
Anyway could you please provide more details about the project? It has generic explanation and I'm not sure that my experience will fit to all your requirements.
Thank you for your time,
Andrey