I need a seasoned mobile developer to turn my rewards-optimization concept into a polished, production-ready app on both iOS and Android. The core of the project is a rules-driven engine that evaluates a user’s card type, current points balance, and stated goal—whether that is travel, shopping, vouchers, or straight cash back—and instantly surfaces the smartest redemption strategy. Because the logic layer is far more complex than a typical CRUD workflow, I am looking for someone comfortable designing and testing algorithms that weigh multiple variables and can be updated easily as issuers change their programs. A feature-rich interface is essential: users should be able to drill into detailed comparisons, simulate different scenarios, and see real-time point valuations without feeling overwhelmed. Biometric authentication (Touch ID, Face ID, compatible Android sensors) is the default sign-in method we want, so please factor in any SDK or OS-level requirements for that. I am flexible on the tech stack—native Swift + Kotlin, Flutter, or React Native are all options—as long as the final build is fast, secure, and passes App Store and Play Store review. You will also help set up a straightforward admin panel or config file so I can adjust reward rules without redeploying the entire app. Deliverables: • Cross-platform mobile app with biometric login and a responsive, detail-oriented UI • Modular rewards engine with unit tests and clear documentation • Simple admin interface or config system for adding/editing card rules • Deployment support through App Store Connect and Google Play Console, including test builds If you have shipped logic-heavy FinTech or loyalty apps before, let’s talk timelines and your preferred approach to the algorithm.