Worked on the FormSG repository to enhance UI testing for the public form flow by building a Chromatic story and comprehensive UI tests for the thank-you page. Leveraged JavaScript and TypeScript to implement mock responses simulating both successful submissions and forms without sections, ensuring accurate rendering and validating the 'submit another form' link through simulated user interactions. Focused on frontend development, mocking, and Storybook to increase visual regression coverage, which helps reduce user experience regressions and strengthens release readiness. This targeted feature improved quality assurance confidence for form-facing pages, with all changes traceable to specific commits for maintainability and transparency.