Mohammad Ashraf worked on the Amsterdam-Team/Plan-Mate-App repository, focusing on architectural improvements to the authentication module. He 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 the modularity and testability of the codebase, allowing for easier mocking and future substitution of data sources without altering the repository logic. Although the work spanned a single feature and did not involve bug fixes, it laid a foundation for more maintainable and adaptable data-layer architecture, reducing risk and supporting faster development cycles.