During November 2024, Y. Tran focused on backend development and PHP unit testing within the shopware/shopware repository, addressing reliability issues in the RecalculationService workflow. Tran resolved a bug affecting delivery data assertions during order recalculation, ensuring that unit tests accurately reflected the expected presence and emptiness of delivery data. By refining the upsert callback test logic, Tran reduced false positives and negatives in continuous integration, directly improving test coverage for delivery data scenarios. The work demonstrated a methodical approach to stabilizing core order processing logic, leveraging PHP and unit testing best practices to enhance the reliability of Shopware’s backend systems.