Developed a complete automotive diagnostic system including a mobile application and a simulated vehicle ECU. The mobile app (built with Dart/Flutter) communicates with a custom ECU simulation that mimics real vehicle behavior, enabling testing and validation of diagnostic features without requiring a physical car. The system supports real-time data exchange, vehicle parameter monitoring, and diagnostic interaction, demonstrating strong skills in embedded systems, automotive protocols, and mobile development. This project reflects real-world automotive engineering workflows.