Supabase is an open-source alternative to Firebase that provides all the backend features needed to ship a project quickly. The company's development team has been using Next.js on Vercel since its beginning and has seen improvements in their developer experience with Turborepo, which simplifies changes to the UI and allows for faster deployment. With Turborepo, developers can make changes locally without needing to manage configuration files, and the entire system can be run locally with a single terminal command. The team also uses Vercel Preview Deployments with commenting capabilities to enable collaboration with external teams, which has streamlined their deployment process.