Developed per-user custom domain support within the is-a-dev/register repository, focusing on enabling seamless onboarding for users requiring personalized domain configurations. Implemented a system for Custom Domain Configuration and Ownership Verification, integrating Vercel verification records to confirm domain ownership and enhance security. The approach established a reusable pattern for domain provisioning, allowing future scalability and consistency across additional users and domains. All changes were documented with Git commit traceability, ensuring transparency and maintainability. The work leveraged skills in domain management, Vercel deployment, and JSON configuration, maintaining platform stability throughout the process without introducing new bugs or regressions during the development period.