I've reviewed the project details you provided and while there aren't any specifics on the type of functionality your IVR requires, I'm confident that I can create a solution that perfectly meets your needs. I have been working with FreeSwitch for a little over 4 years, after converting from Asterisk (programming in C/C++ for almost 25 years), and currently run my own FreeSwitch 1.2 server which handles call routing for many of my clients.
I have developed simple IVR applications (Intro -> menu -> extension -> voicemail) as well as complex systems that route calls based on the caller ID, include multiple menus, hundreds of extensions in multiple groups, and more. I have also developed a system which allows customers to pay for services via their telephone (full credit card input and validation with PHP backend), and a simple phone verification system. My most recent FreeSwitch app was a speed dating (via telephone) system that handled user authentication, and ran the entire dating process.
While I would love to share the above apps, all of my work is created for clients and owned solely by them, just as I would not be able to share your app with a potential client I can't share theirs with you.
If you would like to further discuss your project requirements I would be happy to arrange a time that we can discuss them here in a live chat. If you have any questions, please don't hesitate to contact me.
Regards,
John