Cross-Platform VoIP Mobile App

I’m ready to turn my concept for a phone-based VoIP solution into a full-fledged mobile application that works seamlessly on both iOS and Android. The app must deliver crystal-clear voice calls, reliable video calls, and real-time messaging inside one clean, modern interface.

I’m open to the stack you prefer—whether that’s a WebRTC-centric approach, a SIP soft-phone implementation, or another proven mobile VoIP framework—as long as it meets the typical expectations for battery efficiency, low-latency audio/video, and secure user authentication. Push notifications, contact integration, and adaptive bitrate handling are essential.

When you respond, please focus on past work that shows you have already shipped or contributed significantly to similar voice-or video-centric apps. Screenshots, live links, or short clips that highlight call quality and UI flow will help me evaluate fit quickly.

Deliverables I’ll be looking for:
• Two production-ready builds (App Store + Google Play compliant)
• Full source code with clear documentation and build instructions
• A brief hand-off session to walk through server configuration and deployment steps

If you have the chops to streamline cross-platform VoIP performance and can demonstrate it through prior launches, I’d like to hear from you.