Custom WebRTC in Java for Android

I'm in need of a proficient Java Android Developer who can seamlessly implement a custom WebRTC. The focal point is to deliver an optimum audio experience. Here's what the project entails:

-Skillset in Java and Android Development
-Expertise in custom WebRTC implementations
-The crux of the task at hand relates to the audio functionality
-The detailed specifics regarding the number of users per session are yet to be determined, but do prepare for substantial scalability

If you have a knack for establishing solid connectivity that breaks no sweat over user quantity, your proficiency will be highly valuable in this project. Looking forward to working with you.