Stefan Nemeth established the backend foundation for the Helios project by setting up an initial Spring Boot server with PostgreSQL connectivity, focusing on maintainable project structure and reliable data access. He configured build tools and deployment scripts to streamline future development and onboarding. In the ls1intum/Artemis repository, Stefan enhanced the CI pipeline by integrating GitHub Actions to upload JUnit test results as build artifacts, ensuring test reports remain accessible even after failed builds. His work utilized Java, YAML, and shell scripting, demonstrating depth in backend development and CI/CD practices while addressing core infrastructure needs rather than feature or bug work.