I’m ready to build a full Duolingo-style experience that works seamlessly on iOS, Android, and the web. Phase one will launch with an English course only, but the codebase must be flexible so I can plug in additional languages later without major refactoring. Core experience I need duplicated: • Interactive, bite-sized lessons that track progress in real time • Gamification layers—XP, streaks, and achievement badges that update instantly • A global leaderboard so learners can compete across all three platforms Progress must sync automatically no matter where someone signs in, and push notifications should encourage daily practice. Feel free to suggest the stack—Flutter, React Native, Swift/Kotlin with a shared backend, or another modern approach—as long as it delivers smooth cross-platform performance and is well-documented. Deliverables expected: • Production-ready iOS, Android, and responsive web apps • Unified backend handling authentication, lesson data, badges, and leaderboard scores • Source code with clear documentation and hand-off instructions • Basic deployment support so I can publish to the App Store, Google Play, and my web host If you’ve shipped gamified education apps before—or cloned complex consumer products—let’s talk timelines and milestones so we can get this platform into learners’ hands as soon as possible.