Raphael Christi contributed to backend robustness and SaaS readiness across two repositories. On raphaelchristi/langflow, he improved pool class validation by replacing isinstance with issubclass, preventing invalid instantiations and reducing runtime errors. He reinforced these changes with targeted tests and enhanced error messages, using Python and SQLAlchemy to improve maintainability and developer experience. For langflow-ai/openrag, Raphael delivered OpenSearch compatibility by introducing all_access to user_roles, aligning access control with SaaS requirements. His work focused on backend development, role-based access control, and testing, demonstrating a methodical approach to both bug resolution and feature delivery within a short engagement period.