Developed a Domain DNS JSON Configuration feature for the is-a-dev/register repository, enabling JSON-based domain ownership and CNAME configuration with support for multiple DNS records through a structured config file. The work involved evolving the schema from single to multi-record support, enhancing data modeling and configuration management practices. By introducing leanhdung.json and refining JSON formatting, the developer improved reliability and compatibility with existing tooling, reducing manual configuration steps and onboarding time for users. The implementation demonstrated careful commit hygiene and a config-driven approach, leveraging skills in JSON, data formatting, and schema evolution to streamline DNS management and minimize misconfiguration risks.