Developed and delivered a JSON-based domain configuration and ownership metadata system for the is-a-dev/register repository, focusing on the Header Builder component. The work involved designing headerbuilder.json to capture domain ownership details, CNAME and URL mappings, and GitHub Pages integration, using JSON for structured data modeling. An owner email field was added to enhance contactability and ownership verification, supporting more reliable domain management. Additionally, DNS configuration was improved by correcting CNAME URL formatting, removing protocols to ensure proper DNS resolution. These changes streamlined domain onboarding and automated management, leveraging skills in DNS configuration, configuration management, and data modeling throughout the process.