Flutter Audio/Video Calling App with Firebase & WebRTC

I built a full-featured mobile app enabling high-quality audio and video calls using Flutter and WebRTC. I implemented Firebase for signaling and push notifications, integrated incoming call UI (even when the app is closed), and developed real-time microphone/speaker recording. I optimized performance, handled background services, and built custom UIs for ringing, calling, and in-call states. The solution is scalable and production-ready.