During June 2025, Olga Viertel developed foundational subject-level management features for the ahumadamob/springboot-calificaciones repository. She introduced the NivelMateria entity, implementing full CRUD operations across the entity, repository, service, and controller layers using Java, Spring Boot, and JPA. Olga also refactored the existing MateriaController to ensure path variables aligned with the new entity structure, establishing a consistent and extensible backend architecture. Her work focused on building the groundwork for future subject-level workflows rather than bug fixes, demonstrating depth in backend development and thoughtful design to support ongoing feature expansion within the application’s subject management domain.