How do you prevent deployment failures?
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Quick Answer
Automated testing at multiple levels, progressive rollout strategies (canary/blue-green), health checks and automated rollback, feature flags to decouple deploy from release, and pre-deploy validation of config and migrations.
Detailed Answer
Reliable delivery is layered: catch defects in CI (unit/integration/e2e, security scans), limit blast radius at deploy (canary with metric gates), fail fast and roll back automatically on health-check regressions, and use feature flags so risky code ships dark and is enabled gradually. Backward-compatible migrations prevent a class of rollback pain.
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Interview Tip
Feature flags (deploy != release) is the differentiator answer here — it decouples shipping code from exposing it.
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