Hello
My name is Rafal, i am professional Windows desktop developer, i work with .Net C#, you may find examples of my work in my portfolio.
I'm affraid it will be hard to make it as a windows service, as printing needs desktop contex. But of course we can make windowless tool that would work in background (tray icon)
What software are you using to view pdf files? It will be best to instruct it to print document, rather than opening document in our app (there could be rendering issues)
I'm free at the moment, i can start right away
Cheers
Rafal