Juan Antonio Medac developed foundational data models for client and pet management in the JuanAntonioMedac/ED_WEB_2024_2025 repository, focusing on the veterinary clinic domain. He designed and implemented the Cliente and Mascota classes using Java, applying object-oriented principles such as inheritance and domain modeling to establish a clean, extensible class structure. This work centralized client and pet data, laying the groundwork for future CRUD operations and improved data integrity. By structuring the domain layer with clear relationships and attributes, Juan enabled more efficient feature development and reporting, demonstrating a solid grasp of Java development and object-oriented programming fundamentals within a real-world context.