• Hybrid Cross-Platform Monorepo: Built a single monorepo architecture leveraging React Native CLI for native mobile performance and Expo Web for instant, zero-install PWA access across desktop and mobile browsers. • Real-Time Slot Orchestration & Double-Booking Prevention: Developed a reactive venue slot manager with dynamic availability states (Available, Reserved, Blocked), guaranteeing database-level atomicity to eliminate conflicting reservations. • Geolocation & Venue Discovery Engine: Integrated React Native Maps and Geocoder APIs to deliver location-aware venue exploration, address-to-coordinate mapping, and distance-based filtering by sport, date, and time. • Player Match Hosting & Community Activity: Built interactive social components enabling athletes to host new matches, reserve specific facility slots, and invite local players to join game sessions. • Enterprise JWT Authentication & RBAC: Implemented stateless session security using JSON Web Tokens (JWT) paired with modular Express middleware to enforce strict Role-Based Access Control (RBAC) for players and admins. • Zero-CLS Responsive Styling & State Management: Formulated platform-agnostic styling using React Native Stylesheets and React Context API to manage complex booking flows without layout shifts or page reflows.