Muhammad Tahir worked on the vitruv-tools/Vitruv repository, focusing on architectural refinement and code quality within the Java codebase. He implemented a targeted change to the AbstractViewSelection class by restricting its constructor visibility from public to protected, thereby enforcing proper subclassing and improving encapsulation. This adjustment reduced the risk of misuse and established safer extension points for future development. Utilizing his skills in Java and object-oriented design, Muhammad enhanced the maintainability and safety of the view selection subsystem. Although no bugs were fixed during this period, his work contributed to ongoing stability through thoughtful API tightening and refactoring.