During February 2025, Max Pohl focused on stabilizing the JobMaster shutdown process in the apache/flink repository, addressing a concurrency issue that affected shutdown reliability. He implemented a fix ensuring the job execution stopping logic runs on the main thread and enhanced asynchronous closing to better tolerate disconnects, directly improving system resilience. To validate these changes, Max added a dedicated test case targeting the FLINK-34227 scenario, thereby increasing test coverage and robustness for shutdown operations. His work leveraged Java and emphasized concurrency, distributed systems, and error handling, demonstrating a methodical approach to improving core system stability through targeted engineering solutions.