Developed and delivered a domain verification and DNS setup feature for the is-a-dev/register repository, enabling onboarding and routing for the custom subdomain hienminh58.is-a.dev. The work focused on implementing a DNS verification workflow that allows users to register domains and configure DNS records for reliable routing and branding consistency. Leveraging skills in DNS configuration, domain registration, and JSON, the developer ensured all changes were tracked with clear, traceable commits. This approach improved the onboarding process for custom domains, enhanced maintainability through disciplined version control, and provided robust documentation for future releases, though no major bugs were addressed during this period.