Worked on the sreichel/magento-lts and OpenMage/magento-lts repositories, focusing on backend development and code quality improvements in PHP. Delivered a REST-based FedEx shipping integration, replacing the legacy SOAP backend to modernize shipping workflows and enhance error handling. Improved Mage_Sales PDF generation by optimizing string length calculations and clarifying docblocks for better maintainability. Addressed static analysis reliability by correcting PHPDoc annotations, enabling PHPStan to more accurately identify method signatures. Contributed to documentation updates and licensing compliance, while applying linter and php-cs-fixer adjustments. Emphasized maintainable, well-documented code and robust API integration throughout the development process.