Ellie Newell focused on stabilizing UI test automation for tax submission flows, working across the hmrc/income-tax-submission-journey-tests and hmrc/income-tax-self-employment-frontend repositories. She addressed intermittent browser failures by upgrading the ui-test-runner, and resolved cache clearing issues by correcting backend URL composition, both in Scala. Her approach emphasized targeted, low-risk changes, using single-purpose commits to improve test determinism and accelerate CI feedback. By leveraging skills in backend development, API integration, and test automation, Ellie enhanced the reliability of automated testing without introducing new features, demonstrating a disciplined engineering process that prioritized stability and maintainability in a short timeframe.