Worked on the AutoMQ/automq repository to enhance the reliability of the s3stream module by delivering comprehensive unit test coverage for the WALCallbackSequencer class. Focused on validating edge cases such as handling an empty queue after processing requests and ensuring correct behavior of the tryFree method for both empty and non-empty queues. The approach included implementing and verifying exception handling in the before method and assessing after method behavior when processing requests with unexpected offsets. Leveraged Java and backend development skills with a strong emphasis on unit testing, ultimately reducing regression risk and supporting safer future code changes and refactoring efforts.