Nathan Hagel focused on improving code quality in the vitruv-tools/Vitruv repository by enforcing the utility class pattern within the VitruvClientFactory component. He addressed a potential misuse issue by introducing a private constructor and explicitly throwing an UnsupportedOperationException, ensuring that the class cannot be instantiated. This change, implemented in Java with an emphasis on object-oriented design principles, enhanced maintainability and prevented unintended usage. Although the work centered on a single bug fix rather than new feature development, Nathan’s targeted approach demonstrated a clear understanding of design patterns and contributed to the long-term robustness of the codebase during the month.