Certify is a high-performance full-stack web application for automated digital credential lifecycle management, built with Next.js (App Router) and TypeScript. Uses Server Actions for compute-heavy tasks including bulk CSV ingestion, dynamic certificate rendering, and cryptographic QR generation. The system stores verifiable records in MongoDB, powers a public verification portal, and features a custom asynchronous SMTP mailer capable of reliably sending thousands of PDF attachments with retry and failure handling.