Andrew Blue developed and integrated the Ontario Health Premiums and Surtaxes feature for the BuildCanada/CanadaSpends repository, expanding the platform’s tax calculation capabilities. He designed modular TypeScript functions to compute health premiums and surtaxes, ensuring accurate and compliant Ontario tax results. By embedding these calculations into the existing workflow, Andrew improved the maintainability and extensibility of the codebase. His work focused on backend logic and seamless integration, with clear commit traceability supporting future enhancements. The project demonstrated his skills in TypeScript, software development, and tax calculation, addressing the need for precise jurisdictional tax handling without introducing new bugs during the release.