Jintak Han contributed to the actualbudget/actual repository by expanding the platform’s currency selection feature to include the South Korean Won (KRW), improving usability for KRW users and supporting international market growth. He updated the TypeScript-based currency data model to ensure consistent formatting across both the user interface and backend, demonstrating attention to data integrity and user experience. The work was delivered through a commit-driven process, with clear release documentation outlining the changes. Using React and TypeScript, Jintak focused on feature-driven development, addressing a specific market need and enhancing the platform’s accessibility without introducing new bugs during the release period.