Worked on the Amsterdam-Team/Plan-Mate-App repository, focusing on architectural improvements to the authentication module. Implemented a DataSource interface to decouple AuthRepositoryImpl from its direct DataSource dependency, applying principles of dependency injection and interface-driven design in Kotlin. This refactoring enhanced modularity and testability, allowing for easier mocking and future substitution of data sources without altering the repository logic. The approach laid the groundwork for platform-specific data sources and streamlined future data-layer changes. No major bugs were addressed during this period, with efforts concentrated on improving code maintainability and reducing risk through modular architecture and dependency inversion techniques.