During April 2025, contributed to the Jij-Inc/ommx repository by addressing a bug related to slack variable duplication in inequality handling. The work involved refactoring the Instance.add_integer_slack_to_inequality method to accept a configurable inequality_integer_slack_max_range parameter, replacing a previously hard-coded constant. This change improved the maintainability and scalability of the codebase, allowing for safer reuse and reducing the risk of incorrect slack allocation in future development. The solution was implemented using Python and applied core software development principles, with all changes linked to a tracked issue and commit for traceability. No new features were added during this period.