Worked on enhancing the accuracy of country-level map visualizations in the preset-io/superset repository, focusing on correcting Türkiye city names within the Country Map Chart. Addressed a core data visualization bug by updating geojson data and frontend logic to ensure regional dashboards display accurate city information, thereby reducing the risk of misrepresentation in business reporting. Collaborated closely with co-authors, maintaining clear commit traceability and effective communication throughout the process. Utilized skills in data visualization, frontend development, and JSON to deliver a targeted bug fix, contributing to the stability and reliability of the visualization tool without introducing new features during the period.