Worked on stability and configuration management across the alphagov/whitehall and alphagov/govuk-helm-charts repositories, focusing on targeted rollbacks to maintain system reliability. Addressed two critical bugs by reverting changes that introduced regressions or deployment risks, specifically restoring Govspeak lead paragraph behavior on history pages and removing an unintended maintenance message from the staging environment. Employed disciplined change management practices, using YAML for configuration and DevOps methodologies to ensure minimal production risk and maintain environment consistency. The work emphasized precise, auditable rollbacks and validation of rendering stability, contributing to robust deployment pipelines and reliable user experiences without introducing new features.