Developed foundational subject level management functionality for the ahumadamob/springboot-calificaciones repository, introducing the NivelMateria entity with comprehensive CRUD operations across the entity, repository, service, and controller layers. Leveraged Java, Spring Boot, and JPA to establish a robust backend structure supporting future subject-level workflows. The work included refactoring the existing MateriaController to ensure path variables aligned with the new entity model, enhancing maintainability and consistency within the codebase. No major bug fixes were addressed during this period, as the focus remained on building out core features and laying the groundwork for scalable subject-level management within the application’s backend architecture.