During December 2024, this developer focused on backend engineering for the apache/phoenix repository, addressing a resource leak issue in query plan cleanup. They resolved the problem by ensuring internal dependencies were properly cleared when query plans closed, which improved resource utilization and reduced the risk of out-of-memory errors during complex operations such as table creation, data insertion, and UNION ALL queries. The solution was implemented in Java and validated through a dedicated integration test, testBug7492, which covered a range of scenarios. Their work demonstrated strong skills in backend development, database management, and integration testing within a large-scale open-source project.