Certd is a full-stack web application for automated SSL/TLS certificate lifecycle management. It provides a pipeline-based engine for applying, renewing, converting, and deploying certificates to over 100 cloud providers, CDNs, and servers. The backend is built with MidwayJS (Koa) and TypeORM, supporting SQLite, MySQL, and PostgreSQL. The frontend uses Vue 3 with the Vben admin framework and Ant Design Vue. The system features a plugin architecture with decorator-based registration for task plugins, DNS providers, access credentials, notifications, and addons. It also includes commercial features such as subscription tiers, invite codes, and enterprise project management. The repository is a monorepo managed with pnpm workspaces and Lerna, containing core libraries, server, client, and numerous plugin packages.