Yingyi Zhang focused on reliability improvements in the Netflix/maestro repository, addressing a critical edge case in the Workflow Management subsystem. She fixed a bug to ensure job events are always enqueued when any instances are unblocked, even if the count falls below the batch limit, preventing workflow stalls and lost events. Her approach involved targeted Java backend development and comprehensive unit testing, including new tests to validate partial unblocking scenarios. By integrating these changes with CI validation, Yingyi enhanced system robustness and maintainability. The work demonstrated careful diagnostic skills and delivered clear business value by improving workflow throughput and reliability.