Liushen focused on backend development and distributed systems, contributing targeted bug fixes to the apache/bookkeeper and Pulsar repositories over a two-month period. In apache/bookkeeper, Liushen addressed a region-aware placement policy issue by ensuring disk weight updates correctly propagated to sub-policies, improving cross-region data placement accuracy and reducing data skew. For both datastax/pulsar and apache/pulsar, Liushen resolved subscription prefix mismatches in the MultiRolesTokenAuthorizationProvider, aligning authorization behavior for single and multiple roles across repositories. The work demonstrated careful code maintenance, test-driven development, and collaboration, utilizing Java and unit testing to enhance system reliability and deployment stability.