During January 2026, Hann Kenn developed a replication reliability test suite for index-mode measures in the apache/skywalking-banyandb repository. Focusing on backend development with Go and gRPC, Hann designed new test cases and supporting data structures to validate replication behavior under node failure scenarios. The work emphasized expanding automated test coverage to ensure data integrity and robustness in distributed environments, reducing production risk from outages. By implementing integration tests for replication and collaborating through peer reviews and co-authored commits, Hann demonstrated a methodical approach to engineering resilient systems. The depth of testing reflects a strong understanding of distributed backend reliability challenges.