I’m ready to turn a clear concept into a polished mobile experience on both Android and iOS. The core of the app is guided breathing exercises delivered through engaging video instructions. I need a developer who can build the full flow—from the welcome screen straight into an intermediate-level exercise library—while keeping the interface clean, calming, and distraction-free. Key points I already know I want: • Cross-platform codebase so we maintain one design, one backend, and consistent performance in the App Store and Google Play. • A modular video player that can loop or advance automatically as each inhale, hold, and exhale segment completes. • A simple progress indicator and subtle haptic cue so users stay focused on their breath rather than the timer. • Space in the architecture to add beginner or advanced levels later without overhauling the database or UI. I will provide the exercise scripts, the video clips, and brand assets; you’ll handle coding, basic UI animation, and publishing support. Clean, well-commented code (React Native, Flutter, or a similarly efficient framework) and a short hand-off document are part of the final deliverable. If you have previous wellness or meditation app examples, please include them so I can see how you approach smooth transitions and calming aesthetics.