On merge, CI runs type checks, lint, unit and integration tests against a real database, then builds an immutable artifact tagged with the commit. That artifact deploys to staging automatically, smoke tests run, then it goes to production behind a gradual rollout with health checks and automatic rollback. Risky behavior sits behind a feature flag, so releasing code and launching a feature stay separate events.
Why interviewers ask this
This tells the interviewer how you actually work day to day and whether you have operated software rather than only written it. They are listening for the same artifact moving through environments, for a rollback story, and for the separation of deploy from release via flags. It also reveals your comfort with shipping frequently, which strongly predicts how you will behave on their team.
How to structure your answer
- Walk the stages in order from merge to production.
- Note that the same artifact is promoted, not rebuilt.
- Describe the rollout and the rollback trigger.
- Explain how feature flags separate deploy from launch.
Example answer
On the last team I was on, merging to main kicked off CI: type check, lint, unit tests, then integration tests against a Postgres container, roughly seven minutes end to end. If that passed, we built a container image tagged with the commit SHA, and that exact image is what moves forward; nothing gets rebuilt per environment, because then you are shipping something you never tested. It deployed to staging automatically, ran a short smoke suite against real endpoints, and then went to production as a rolling deploy with health checks, watching error rate and latency for a few minutes with an automatic rollback if either crossed a threshold. Migrations ran as a separate step ahead of the deploy and were always backwards compatible, so a rollback of the code never left the schema stranded. Anything user visible went out behind a flag, defaulted off, then to internal users, then a percentage. That distinction mattered more than anything else, because it meant a bad launch was a config toggle rather than an emergency deploy at nine at night.
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See how it worksFollow-up questions to expect
- How would you roll back a deploy that included a migration?
- Who is responsible for cleaning up stale feature flags?
- What would you change if the test suite took forty minutes?
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