During February 2025, Jae Chul Yoon developed environment-specific CI/CD pipelines for the SystemConsultantGroup/S-top-frontend repository, focusing on safer and more efficient deployment processes. He introduced a dedicated CI workflow for QA on the develop branch and restructured the production pipeline on the main branch, using YAML for configuration and leveraging GitHub Actions to automate deployments. This approach enabled isolated QA and production releases, reducing cross-environment risks and improving deployment governance. By applying skills in CI/CD, Docker, and Git workflows, Jae Chul Yoon delivered a solution that accelerated QA feedback cycles and clarified release management without addressing major bugs.