Developed foundational domain model scaffolding for the ypech-itescam/POO-2025 repository, focusing on establishing core object-oriented data structures in Java. The work involved designing and implementing domain objects across multiple packages to represent cameras with MicroSD cards, sum calculators, product sales, university structures, and vehicle ownership. Emphasizing maintainable design and scalable relationships, the approach leveraged object-oriented programming principles and data structures to support future feature development. No major bug fixes were documented during this period, as the primary focus was on building a robust and extensible foundation for business logic and future enhancements within the Java codebase.