During December 2025, Ysys focused on backend stability for the Tencent/WeKnora repository, addressing OpenAI API compatibility issues. They refined the backend-provider logic in Go and Python, ensuring that ChatTemplateKwargs parameters were only included for custom backends, which prevented 400 Bad Request errors with the official OpenAI API. Their work involved careful API integration, robust error handling, and test-driven debugging to align connection tests with the new parameter handling. By tightening parameter validation and adding guard logic, Ysys improved reliability and maintainability for downstream deployments, demonstrating depth in backend development and a clear understanding of integration with external services.