Well, I am your guy. I have done quite a lot of work on C++ and PHP, and some involving both. Most recently I had an raspberryPi project where there was a user interface written in PHP, it would record the user input into a database while a C app would read the database and set some outputs accordingly. Though I have not used RTBkit before this is well within my expertise.
Of course before proceeding I would need more details about the project. If you decide to work with me you should PM me more details before accepting my bid. I would not be able to accept this project without more details.
Regards