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How do feature flags decouple code deployment from feature release in a CI/CD workflow?

Intermediate

Answer

Feature flags let you deploy code containing a new feature to production while keeping it disabled/hidden behind a flag, separating the technical act of deployment (shipping code) from the business decision of release (making a feature visible/active) -- this allows continuous deployment of incomplete or in-progress features without user impact, and enables gradual rollout, A/B testing, or instant kill-switch rollback without a new deployment.
builder.Services.AddFeatureManagement();

if (await featureManager.IsEnabledAsync("NewCheckoutFlow")) {
    return NewCheckoutHandler();
} else {
    return LegacyCheckoutHandler();
}
// Code is deployed; the flag controls whether it's actually active
Real-world example A team merges and deploys a large in-progress checkout redesign to production daily behind a feature flag disabled for all users, avoiding a risky long-lived feature branch while keeping the feature completely invisible until it's ready and explicitly enabled.

Common follow-ups: How do you clean up feature flags after a feature is fully rolled out?;What's the difference between release flags and permanent operational flags (like a kill switch)?

Configuration & Options;Microservices & Distributed Architecture Patterns
All 16 CI/CD, Publishing & Deployment questions