Feature Flag Strategies

# Feature Flag Strategies

Feature flags decouple deployment from release. Ship code anytime, enable features when ready.

## Types of Flags

**Release Flags**

Temporary. Enable new features gradually. Delete after full rollout.

**Operational Flags**

Permanent. Circuit breakers, maintenance modes, A/B tests.

**Permission Flags**

Access control based on user tier or role.

## Implementation Patterns

**Simple Toggle**

Boolean on/off. Good for basic cases.

**Percentage Rollout**

Enable for X% of users. Gradually increase.

**User Targeting**

Specific users, user groups, or attributes.

## Best Practices

- Clean up old flags

- Monitor flag performance

- Document flag purpose

- Test both states

**Tools**: LaunchDarkly, Unleash, Split.io

## Benefits

- Trunk-based development

- Safer releases

- Quick rollbacks

- A/B testing

- Gradual migration

Feature flags are essential for continuous delivery.