Mark Herbert contributed to the hmcts/tax-tribunals-datacapture repository by delivering eleven features and resolving critical security and stability issues over six months. He focused on enhancing accessibility testing, modernizing the Ruby runtime, and improving user-facing workflows such as password reset reliability and account retention. Mark applied dependency upgrades and security patches across Ruby, Node.js, and Docker environments, ensuring compatibility and reducing vulnerabilities. He also improved localization, documentation consistency, and deployment readiness. Using Ruby, JavaScript, and YAML, Mark’s work demonstrated a thorough approach to DevOps, CI/CD, and frontend development, resulting in a more robust, maintainable, and secure application platform.