During December 2024, Thomas Fung focused on maintaining tax compliance within the Shopify/worldwide repository by correcting Indonesia’s tax rate from 10% to 12%. He ensured this update was consistently applied across the codebase, including the CHANGELOG, Gemfile.lock, region data, and version files, using Ruby and YAML for configuration management and internationalization. Thomas’s work improved data integrity and accuracy in tax calculations, directly impacting customer checkout and tax reporting for Indonesian users. While the scope was limited to a single bug fix, the update was thorough and traceable, reflecting careful attention to regulatory detail and cross-file consistency in implementation.