Worked on the cloudnativedaysjp/cnd-handson repository to deliver developer-facing documentation and infrastructure improvements for a cloud-native hands-on event. Focused on refining Kubernetes manifests and optimizing container images, while also enhancing ingress and service configurations to improve deployment reliability and accessibility. Used Markdown and YAML to establish a clear README structure and participant setup instructions, streamlining onboarding and reducing operational errors. Addressed formatting issues to ensure YAML compliance and proper document structure, contributing to long-term maintainability. Demonstrated proficiency in containerization, DevOps, and Git, with work that improved the stability of hands-on labs and the efficiency of event execution.