Worked on stabilizing the Mattermost test suite by addressing flakiness in critical areas such as attachments, history preservation, channel joining, and email-related functionality. Applied targeted fixes in Go to ensure deterministic test outcomes, including per-run mailbox isolation and improved wait strategies for message retrieval. Enhanced the reliability of continuous integration pipelines by reducing non-deterministic failures and shortening feedback loops for pull request validation. All changes were production-safe and limited to tests, focusing on improving quality without introducing new features. Demonstrated strong skills in Go, software development, and testing while contributing to the mattermost/mattermost repository over two months.