Worked on the is-a-dev/register repository to deliver a new subdomain configuration feature focused on domain management. Developed and integrated JSON configuration files to support the setup of the 'loureir-or-not' subdomain, enabling the addition of DNS records such as TXT, A, and CNAME. This approach streamlined the process of managing subdomain DNS settings and improved the flexibility of domain configuration within the application. Leveraged skills in DNS configuration and domain management, utilizing JSON as the primary language for defining infrastructure changes. The work addressed the need for more granular subdomain control, though the scope was limited to feature delivery without bug fixes.