Worked on stabilizing the MQTT test suite for the photoprism/nats-server repository, focusing on backend development and testing using Go. Addressed persistent race conditions by implementing a per-test server lifecycle, ensuring each MQTT test iteration started with a fresh server instance. This approach improved test determinism and reduced continuous integration noise, allowing for faster feedback and clearer bug isolation. Additionally, skipped unreliable cluster connect and disconnect tests to further minimize false failures in CI pipelines. The work enhanced the reliability and maintainability of the MQTT-related tests, contributing to a more robust development workflow and higher confidence in backend changes.