Mark Herbert contributed to the hmcts/tax-tribunals-datacapture repository by delivering six features over three months, focusing on platform stability, accessibility, and security. He enhanced automated accessibility testing using pa11y, expanded test coverage, and upgraded the Ruby runtime and dependencies to address security and compatibility. Mark also improved content management by updating privacy information and standardizing documentation, which streamlined onboarding and deployment. His work included upgrading the GOV.UK Frontend library and maintaining dependency hygiene across Docker, Ruby, and Node.js environments. Through these efforts, Mark demonstrated depth in DevOps, Ruby on Rails, and automated testing, ensuring a robust and maintainable codebase.