I’m building a mobile application that lets users learn entirely new languages, taking them from absolute beginner through intermediate and on to advanced proficiency. To keep learners engaged at every stage, I want three core study methods baked into the experience: • Interactive quizzes that adapt to the user’s current level • Flip-style flashcards for rapid vocabulary review • Streamable and downloadable audio lessons for pronunciation practice The interface should feel clean and intuitive—think a Duolingo-style flow but with my own branding and colour palette. Smooth onboarding, spaced-repetition scheduling, progress tracking, and push notifications for daily streaks are all must-haves. I’m fine with Flutter, React Native, or fully native stacks, as long as the final build runs reliably on both iOS and Android and is ready for App Store and Google Play submission. Please structure the code so new languages and lesson packs can be added later via a simple JSON file or CMS. Deliverables – Documented source code – Release-ready iOS (.ipa) and Android (.aab) builds – Short user guide plus admin instructions I’ll review work in milestones: initial UI prototype, quiz/flashcard engine, audio module, and final polish/store submission. If you’ve shipped language-learning or ed-tech apps before, I’d love to see them. Let’s create something learners will open every day.