Oscar Herrera established the initial backend foundation for the andressalamancaumng/2025i-pruebas repository, focusing on creating a scalable project structure using FastAPI and Python. He organized the codebase by setting up a clear file hierarchy and standardizing dependency management through a renamed requirements file. Although no functional endpoints were implemented during this period, his work provided a clean, maintainable baseline for future development. The backend skeleton was designed to support rapid feature expansion, facilitate onboarding, and enable potential CI/CD integration. Oscar’s approach emphasized backend development best practices, laying essential groundwork for subsequent services, endpoints, and automated testing infrastructure.