Seitaro Shinagawa developed a customizable metric naming feature for the ExactMatch metric in the sbintuitions/flexeval repository, enabling users to specify a metric_key parameter that propagates through output summaries and per-instance details. He approached the task with a focus on backward compatibility and test-driven development, implementing robust unit tests to validate the new functionality and prevent regressions. Using Python and leveraging skills in metric implementation and software testing, Seitaro ensured that the changes improved dashboard readability and reporting accuracy. The work demonstrated careful attention to maintainability and clarity, expanding test coverage while addressing a concrete need for clearer metric reporting.