During June 2025, Khoa contributed to the nocodb/n8n-fork and langgenius/dify repositories, focusing on backend feature development and data validation. He built workflow filtering capabilities in the N8n node, enabling filtering by name and project ID and allowing exclusion of pinned data from responses, which improved workflow reliability and data accuracy. In langgenius/dify, he implemented robust validation for dataset API model providers, enhancing configuration safety and error handling for embedding and reranking models. Working primarily with TypeScript, Node.js, and Python, Khoa emphasized clear commit practices, delivering maintainable code that strengthened API integrity and developer experience across both projects.