Joe Griffiths upgraded the Image Copier Lambda runtime in the guardian/amigo repository, focusing on modernizing infrastructure and improving operational reliability. He updated AWS CDK libraries and dependencies to align with the latest Java runtime, ensuring compatibility and maintainability across environments. Using TypeScript and AWS CLI, Joe also enhanced documentation by refining the README instructions for listing stack instances, enabling operators to accurately identify targeted accounts through improved command usage with jq. His work addressed both feature development and bug fixes, demonstrating depth in DevOps practices and delivering a more robust, user-friendly deployment process for multi-account AWS environments.