Twilio recently overhauled its documentation site using Next.js and Markdown. The previous platform was based on an open-source CMS called Wagtail, but it didn't meet the needs for hosting a technical docs site. The new solution uses MDX, which is a superset of Markdown that allows embedding React components, and Next.js for rendering. Vercel was chosen as the hosting provider due to its features like preview deployments, server-side rendering options, and integration with Twilio's AWS resources.