Serhii Omelchuk worked on the xm-online/xm-uaa repository, focusing on enhancing security and maintainability through containerization and DevOps practices. He upgraded the Docker base image from adoptopenjdk:11-jre to eclipse-temurin:11-jre, ensuring the application runs on a current, supported Java runtime environment. This change did not alter the application’s functional code but improved the security posture and long-term support of the deployment pipeline. Serhii utilized Dockerfile expertise to isolate the impact to the runtime layer, aligning with best practices for container security. The work demonstrated a targeted, infrastructure-focused approach rather than broad application-level engineering depth.