Eugenie Kim refactored the CS-Winter2025/backend repository to establish a modular, maintainable architecture using C#. She reorganized models and controllers into dedicated Areas folders, renaming files to reflect their new structure and reduce cross-module coupling. This backend development effort focused on code organization and refactoring, providing a clear foundation for scalable feature development and streamlined onboarding. Eugenie documented rollback guidance within a single commit, ensuring safe reversibility if needed. The work improved testability and set the stage for independent feature teams, lowering long-term maintenance costs and supporting faster integration workflows through a cleaner, more modular project structure and codebase.