Dub, an open-source link management platform, has grown to 3,000 active domains with Vercel's multi-tenant SaaS toolkit. Dub's growth rate is remarkable at 25% month-over-month, and it now serves over 5 million redirects per month. Vercel simplified the complexity of domain management by providing a powerful API that allowed Dub to efficiently manage custom domains from the outset. This simplification enabled Dub to focus on innovation rather than backend complexities, while also removing significant barriers associated with SSL management, allowing for cost-effective and high-security solutions.