During August 2025, Julian Arenas developed the foundational Parallel Race Feature for the MartinCU990558/Laboratorio-DOSW-02 repository, focusing on establishing a base for concurrent simulations. He implemented the CarreraParalela class in Core Java, providing a main method that initiates a basic parallel race flow and outputs a race-start message. This work created a concrete, extensible entry point for future parallel logic and testing, supporting the system’s performance and scalability goals. While the implementation was limited to a single feature and did not address bug fixes, it demonstrated clean code structure and laid groundwork for further concurrency enhancements in Java.