During February 2025, Andreas focused on backend development for the apache/tomcat repository, addressing a critical logging inconsistency in the Http2UpgradeHandler component. He resolved a bug where log messages alternated between info and debug levels by centralizing the logging logic through a static UserDataHelper. This Java-based solution ensured consistent log output during HTTP/2 upgrade flows, reducing noise and improving the clarity of operational logs. By aligning the fix with the project’s traceability standards, Andreas enhanced both debuggability and long-term maintenance. His work demonstrated depth in Java backend engineering and contributed to more reliable upgrade sequencing within the Tomcat codebase.