Worked on backend systems for the langflow-ai/openrag and raphaelchristi/langflow repositories, focusing on OpenSearch integration and robust pool class validation. Delivered OpenSearch compatibility by enhancing user role management, aligning backend logic with SaaS deployment requirements, and reinforcing role-based access control. Improved the reliability of pool class instantiation in langflow by replacing isinstance with issubclass, preventing invalid configurations and runtime errors. Added targeted tests and clearer error messages to streamline debugging and reduce maintenance overhead. Utilized Python and SQLAlchemy throughout, emphasizing maintainable code and automated testing to ensure long-term stability and security in backend infrastructure and access control workflows.