Worked on the alphagov/whitehall repository to enhance data integrity for government statistics announcements by addressing a critical validation issue. Focused on ensuring that statistics announcements are invalidated when their related publications remain unpublished, thereby reducing the risk of inaccurate data being released. Strengthened the validation logic to prevent the publishing of invalid statistics announcements, directly improving the reliability of published information. Applied test-driven development practices and updated unit tests in Ruby to align with the new validation requirements. Utilized Ruby on Rails and unit testing to deliver a robust solution that supports accurate and dependable government data publishing workflows.