Worked on backend reliability and correctness in distributed systems, focusing on bug fixes across apache/bookkeeper and Pulsar repositories. Addressed a disk weight update issue in BookKeeper’s region-aware placement policy by propagating updates to sub-policies and validating the fix with targeted Java unit tests, improving cross-region data placement stability. In Pulsar, resolved subscription prefix mismatches in the MultiRolesTokenAuthorizationProvider for both datastax/pulsar and apache/pulsar, aligning behavior across repositories and reducing authorization errors for single and multiple roles. Demonstrated backend development and test-driven practices, emphasizing code maintenance, cross-repo consistency, and deployment reliability using Java and distributed systems expertise.