full-stack Flight Management System that goes far beyond basic CRUD: I designed a secure Spring Boot (Java 21) backend with JWT + OAuth2 authentication, role-based access, MySQL/Flyway production support, and advanced modules for operations control, aircraft/crew/gate scheduling, pricing engine, passenger portal, finance tracking, workflow approvals, incident support, and live flight tracking on a world map. On the frontend, I built a React + Vite dashboard with protected routes, real-time-style data views, analytics, and a clean user experience tailored for operational teams.