Michael Joel contributed to the Dataflux-U-nidos/Backend repository by optimizing the Docker image build process and refining backend data contracts. He implemented a multi-stage Dockerfile using Docker and TypeScript, separating build dependencies from runtime and ensuring only essential artifacts were included in the final image. This approach reduced image size, improved deployment speed, and enhanced security. Additionally, Michael fixed a DTO type alias to align with backend data contracts, supporting API stability and reducing potential runtime errors. His work focused on backend development and containerization, consolidating these improvements into a single, well-structured commit during April 2025, demonstrating solid engineering fundamentals.