I’m ready to move our Ninja Private Messenger from concept to fully functioning release and need a seasoned mobile developer to take the lead. The initial build must ship simultaneously on iOS and Android and feel completely native on both platforms. Core scope • Real-time one-to-one and group chat that handles text, images, and basic file attachments seamlessly. • High-quality voice and video calling with quick connection times on typical 4G networks. • Standard account creation, contact sync, and push notifications. Code quality matters: I want clean, well-documented code, modular architecture, and a straightforward path for future feature additions. If you lean on Flutter, React Native, Kotlin/Swift, or another proven cross-platform stack, tell me why it’s the right fit; if you prefer purely native builds, outline the advantages and timeline. Acceptance criteria 1. Both apps pass Apple TestFlight and Google Play internal testing with no critical crashes. 2. Group chat supports at least 100 users without noticeable lag. 3. Voice/video calls connect in under 3 seconds and maintain stable audio/video for 10-minute sessions in average network conditions. 4. Source code, build scripts, and concise setup documentation are delivered via a private Git repository. If this aligns with your expertise, include a brief architecture outline, notable chat/call apps you’ve shipped, and a realistic delivery schedule.