Web & Mobile App Developer — Gamified EdTech Platform (React Native Web / Flutter)

About the Project Sabaki Courses is a Romanian online mathematics learning platform with 350+ professionally produced video lessons, a working subscription platform, and over 1 million organic views on social media. Think Duolingo, but for Romanian high school math. We're building a gamified learning experience across web, iOS, and Android that wraps our existing video content in an engaging, habit-forming product. The foundation — the content library — is already built. Your job is to build the product that makes it scale. You can explore the current web platform here: sabakicourses.ro What We're Building A cross-platform gamified learning experience running on iOS, Android, and web — one product, all three surfaces. The ideal approach is a single codebase (React Native Web or similar) that deploys across all platforms, keeping development and maintenance lean. We're open to discussing architecture, but separate codebases for web and mobile are unlikely to be the right fit given our budget and team size. Core features: Video player — seamless playback of existing course videos (currently hosted on Vimeo), organized by course and chapter Gamification layer — XP points, badges, daily streaks, and a leaderboard Progress path — visual map of the curriculum showing completed, in-progress, and locked content Freemium model — Chapter 1 of every course is free; subsequent chapters require a premium subscription Subscription management — integration with in-app purchases (App Store / Google Play) and/or a payment gateway (Stripe or similar) User authentication — login, registration, progress sync across devices and platforms Progress tracking — completion tracking per video and chapter, with chapter tests and results stored per user Push notifications — streak reminders and engagement nudges (mobile) Tech Stack Preferences React Native Web is our preferred approach — one codebase for iOS, Android, and browser Alternatively, Flutter with web support is worth discussing Backend: flexible — can integrate with the existing Open edX backend or build a lightweight new one Clean, modular, well-documented code — this needs to be maintainable and scalable long-term Experience with Vimeo SDK or similar video embedding is a plus What We're Looking For Proven experience building production apps across web and mobile — please share live links or portfolio Experience with gamification mechanics (streaks, XP, leaderboards) is a strong plus Experience in edtech, e-learning, or subscription-based apps is a strong plus Ability to work independently and take ownership — this is not a task-by-task project, we need someone who can think about the product Good communication in English Romanian language skills are a bonus but not required Engagement We're open to working with either an individual developer or a small agency. We're currently in fundraising and expect to begin development in Q3/Q4 2026. This post is partly exploratory — we want to understand who's out there, what approaches they'd take, and what the realistic cost and timeline looks like for an MVP. Please include in your application: Links to 1-2 relevant apps you've built — ideally cross-platform, with gamification or subscription features A brief note on your recommended architecture — how you'd handle the web + iOS + Android requirement from a single codebase, how you'd approach the video layer, how you'd structure the gamification backend Your rough estimate for timeline and budget for the MVP described above Budget is open for discussion based on scope and approach. We're looking for quality over the cheapest quote.