Hi,
I understand your needs and can help you on them. I've got 19+ extensive experiences in network infrastructure, and one of which is in AAA using several methods and technologies, including Radius and Diameter. I'm also familiar with commercial enterprise/provider devices like Cisco tactics+, juniper, mikrotik, alu/ale, Huawei, etc as well as devices based on open source linux in many forms including freeradius
Please drop me a message and we can discuss further about your needs and requirements so I can help you as well as I can.