During October 2024, Kacper Zalewski focused on improving the reliability of distributed testing for the apache/cassandra repository. He addressed a persistent shutdown race condition in Cassandra’s distributed test suite by configuring the test harness to set setIsShutdownUnsafeForTests(true), which eliminated flaky shutdown-related failures. This change stabilized continuous integration results and accelerated feedback cycles for release readiness. Working primarily in Java and leveraging his expertise in distributed systems and testing, Kacper’s targeted fix enhanced the quality and dependability of automated test outcomes. The work demonstrated a deep understanding of debugging complex distributed environments and maintaining robust CI pipelines for large-scale projects.