I've deployed over 20 projects on Vercel across the last two years. Portfolio sites, SaaS dashboards, client demos, AI-powered tools, and internal utilities. Vercel's DX is exceptional, but there are production lessons that the getting-started docs don't cover.
Lesson 1: Preview deployments are your QA environment. Every pull request gets a unique URL. I share these URLs with clients for review before merging to main. The feedback loop drops from 'deploy → client tests → files bug → I fix → redeploy' to 'preview URL → client reviews → approves → merge.' For client-facing projects, this workflow alone justifies the Vercel Pro plan.
Lesson 2: Environment variables need discipline. I use a naming convention: NEXT_PUBLIC_ prefix for client-side variables, no prefix for server-only secrets. Every project has a.env.example committed to the repo with placeholder values and comments explaining each variable. When a teammate (or future me) sets up the project, they copy.env.example to.env.local and fill in the values. No guessing, no Slack messages asking 'what's the Supabase URL?'
Vercel Analytics and Speed Insights give real-user LCP, FID and CLS segmented by device, browser and geography. I found a portfolio site with a 4.2s mobile LCP in Brazil because of an unoptimized hero image: desktop metrics looked fine.
A monorepo with Turborepo shares the component library, but build times grew because Vercel rebuilt all projects on every push. The fix is Root Directory in project settings plus an Ignored Build Step that skips unchanged projects.
Lesson 5: Monorepo support with Turborepo is powerful but requires setup discipline. I tried consolidating three client projects into a single monorepo. The shared component library worked beautifully, but build times increased because Vercel was rebuilding all projects on every push. The fix: configure Root Directory in Vercel project settings and use the Ignored Build Step command to skip rebuilds for unchanged projects.
The full cycle is: push to GitHub to Vercel preview deploy, test on the preview URL, merge to main to production deploy, verify the production URL, enable Analytics. Under ten minutes from code-complete to live.
The deployment pattern I use for every new project: push to GitHub → Vercel auto-deploys preview → test on preview URL → merge to main → Vercel auto-deploys production → verify production URL → enable Analytics. Total time from code complete to live: under 10 minutes. That speed is why I keep coming back to Vercel despite having experience with AWS, GCP, and Cloudflare.
Reference: Vercel documentation on preview deployments.