During July 2025, Gak focused on optimizing set operations within the google/cel-java repository, specifically targeting the CelUnknownSet union functionality. He refactored the union operation to leverage Java’s Sets.union and SetView.immutableCopy, incorporating a pre-sized builder to minimize internal hash table churn. This approach improved both memory efficiency and CPU utilization, directly addressing scalability concerns for high-load workloads. By aligning low-level data structure choices with business goals, Gak enhanced set-union throughput and reduced garbage collection pressure in client-facing query processing. His work demonstrated depth in Java, performance optimization, and set operations, delivering a targeted feature with measurable impact on system efficiency.