Hiring Developer for website updates

Hello,

It has been a while since I've been to WPMUdev and a lot has changed! I need to update my website that runs some WPMUdev plugins, including membership, and I don't have the time to do it myself.
Is there a list of developers that work with WPMUdev specifically? What is the best way for me to reach out to developer's about this project?
Basically I need a web developer to update the functionality of my membership website with payment gateway, including several plugins.
Here's the basics:
1. update WP
2. update theme
3. update membership plugin with functioning payment gateway
4. update critical plugins: SB Welcome Email, mTouchQuiz

*possible for ongoing relationship
*not any design-specific issues, or copy

Thanks for pointing me in the right direction!

Regards,
Bobby Andrews