Mohammad focused on stabilizing subscription routing logic in the Gozargah/Marzban repository, addressing compatibility issues introduced by Python 3.12. He resolved syntax warnings by updating regular expression handling to use raw strings, ensuring that backslashes were interpreted correctly and reducing the risk of runtime errors. His work improved the maintainability and robustness of the backend code, particularly in the routing logic that processes API requests. By aligning the codebase with Python 3.12 best practices, Mohammad laid the groundwork for future compatibility. His efforts demonstrated depth in backend development and regular expressions, with all changes delivered in Python.