During December 2024, Nhat Tran Minh focused on overhauling the checkout flow for the nashtech-garage/yas repository, aligning it with a new design to improve reliability and data handling. He refactored the backend service layer using Java and Spring Boot, integrating enhanced product information retrieval from product services and updating model mappings and API constants. His work introduced more robust error handling and strengthened authorization checks within the checkout process, increasing both resilience and security. By concentrating on API integration and microservices architecture, Nhat delivered a deeper, more maintainable checkout experience, addressing both technical debt and evolving business requirements.