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Something you shipped an hour ago is now failing for real users, and your only plan is to start a whole new deploy to undo it.
What you'll have at the end
A flag wrapping the new code path that, when flipped off, restores the old behavior with no deploy
You need
A live API release running as more than one process, with its own database you can add one small table to.
Not covered
Percentage-based rollouts and audience targeting, which ramp a feature up gradually. This is a single boolean built for the opposite move, fully on to fully off in one step.
Leans on
Does your rollback restore the last working version?
a deploy-level rollback drill you still need, since a kill switch only covers the exact path you decided to wrap in a flag.
Add a schema change that both old and new code can use
when the release also changed your schema, flipping this flag back doesn't undo that migration, and you need that pattern too.
Checked 19 Aug 2026
Part of the Backend Deployment cookbook