I want to bring a new social-networking mobile app to life, focused entirely on letting users share photos and videos with one another. The core requirements are straightforward: • Native or cross-platform mobile build (iOS and Android) • Smooth photo/video upload, playback, and feed browsing • Secure sign-up, login, and basic profile management • Scalable back-end with a clean API to support real-time content delivery I already know I do not need messaging or elaborate profile extras right now—the first milestone is a clean, reliable content-sharing experience that feels fast and modern. Please outline your preferred tech stack, any similar work you have launched, and the timeline you’d need for an MVP and subsequent iterations.