I’m building a category-specific trivia game that will run natively on both iOS and Android from a single codebase. Players will choose a category, answer timed multiple-choice questions, collect points, and track their rank on a live leaderboard. Smooth animation, snappy transitions, and a clean, modern UI are essential because the experience needs to feel as polished as top trivia titles already in the stores. You are free to suggest the most efficient stack—Flutter, React Native, Unity, or another cross-platform framework—as long as the final builds pass App Store and Google Play submission checks. I’ll supply the initial pool of questions in JSON; the app should read from that file but also be ready for future expansion through an admin panel or remote update. Deliverables • Complete source code with clear comments and build instructions • iOS (IPA) and Android (APK/AAB) release candidates ready for submission • Modular question engine that loads category-specific sets from JSON or a remote endpoint • Basic but secure user account system (email, Apple, Google, or guest) • In-game leaderboards, score tracking, and category statistics stored in the cloud (Firebase, Supabase, or similar) • Polished UI/UX assets and all rights transferred at hand-off Acceptance criteria 1. Both app versions install and run without crashes on current iOS and Android devices. 2. Selecting any category loads its unique set of questions and records scores locally and in the cloud. 3. Leaderboard updates in real time across devices. 4. All major app-store compliance checks (privacy policy links, permission prompts, screen-size support) are met. Once these points are verified, we’ll wrap up with a short knowledge-transfer call so I can maintain the project moving forward.