I identified that the platform's critical modules were disconnected and isolated from the main flow. I designed and fully integrated the charges and expenses management modules, unifying the fleet's financial logic, and built the live trip-route monitoring system to consolidate real-time operational traceability within the application's ecosystem.

I designed optimized relational data models with Spring Data JPA/Hibernate to dynamically link unexpected expenses with active routes, ensuring financial data consistency and preventing duplicate records through database-level constraints in PostgreSQL.

I implemented server-side logic with Spring Boot for automatic balance and fuel-consumption calculations, exposed efficient REST endpoints with Spring MVC to update live route coordinates, and used Spring's async processing (@Async / scheduled tasks) to process deviation or overspending alerts in the background without hurting the user experience.

Achieved 100% integration of the operational modules, letting administrators see exact per-trip costs in real time and reducing manual expense-reconciliation errors.