Joseph contributed to the docker/mcp-gateway repository by addressing schema validation issues in backend tooling. He enhanced the mcp-config-set and mcp-exec tools by introducing a Types field to their parameter schemas, enabling explicit specification of acceptable JSON types such as string, number, boolean, object, array, and null. This adjustment resolved validation errors encountered with strict JSON Schema validators and eliminated 500 errors in integrations with Fireworks AI. Joseph validated these fixes through targeted tests and real-world workflows, improving reliability and maintainability. His work leveraged Go for backend development and demonstrated a strong grasp of API design and JSON schema validation.