Preview first
Every change should land on a preview URL that mirrors production. Share that link for QA before promoting.
Cutover
Production builds a new release beside the live one. Traffic switches only after health checks pass.
Health checks
We probe critical routes — not just the homepage. Failed checks cancel cutover and keep the previous version live.
Rollback
Roll back from deploy history to any healthy prior release. Rollback is a traffic shift, not a full rebuild.
Deep dive: Zero-downtime deploys with preview environments.