Worked on the canonical/ubuntu.com repository to address a critical bug affecting tax processing accuracy for regional compliance. Focused on correcting Tax ID Type Determination for South Africa and the EU, the developer implemented a targeted JavaScript fix that improved country-code mapping and validation logic. This adjustment reduced the risk of tax misclassification and enhanced the user experience during tax-related workflows. By strengthening the validation of tax data on the front end, the work contributed to more reliable regulatory compliance and transaction accuracy across multiple regions. The contribution demonstrates attention to detail and a methodical approach to solving compliance-driven engineering challenges.