During October 2024, Chris Brennan enhanced the OlapScanNode component in the pinterest/starrocks repository, focusing on backend performance optimization using Java. He refactored the query execution path to ensure that getAliveComputeNodes is invoked only once per query, reducing redundant calls and lowering per-query overhead. To support this, he introduced a private helper method, checkSomeAliveComputeNode, and developed unit tests to verify the single-call behavior, emphasizing maintainability and test-driven development. This targeted change improved OLAP scan throughput under concurrent workloads. Chris demonstrated strong skills in backend development, code refactoring, and performance optimization, delivering a focused and well-tested feature enhancement.