Hello and greetings!!
I am a C++ engineer form a strong R&D background working for top/global names in manufacturing(consumer electronics), software and government.
I was head hunted by Microsoft 4 times, in the past 25 years to work on their VC++ and other R&D teams, based in their UK R&D labs.
Anyway, I can help you with any Credential Provider based custom development, using their Credential Provider API- using C++.
I have worked on some custom Login and authentication solutions for WINdows 7 , using the Cred. Prod. API and C++.
If you wish to share more information on what kind of custom authentication or login functionality you wish to provide for WIndows - and targetting which versions of WIndows- I am certain I can be of assistance to you.
I am known to work very fast, so any initial Credential Provider solutions should be ready for testing within a matter of weeks.
Cheers