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Practical articles on feature flags, gradual rollouts, and shipping software safely.

Feature Flags vs Environment Variables

Environment variables are great for static configuration. Feature flags are built for runtime decisions, gradual rollouts, targeting, and rollback control.

#feature flags#environment variables#runtime configuration#release safety
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How to Implement Gradual Rollouts

A gradual rollout lets you expose a feature to 1%, 10%, 50%, and then 100% of users while limiting the blast radius of production surprises.

#gradual rollouts#percentage rollout#feature flags#progressive delivery
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Feature Flag Kill Switches

A kill switch is the fastest way to disable risky production behavior without waiting for a rollback, hotfix, or redeploy.

#kill switches#feature flags#incident response#rollback
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JavaScript Feature Flag SDK

Use the JavaScript feature flag SDK to evaluate flags in Node.js services with safe defaults, user context, and production-ready error handling.

#javascript sdk#node.js#feature flags#api keys
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Java Feature Flag SDK

Use the Java feature flag SDK in JVM services with stable user identifiers, explicit defaults, and environment-scoped API keys.

#java sdk#spring boot#feature flags#backend services
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REST API Feature Flags

Use REST API feature flag evaluations from any language or service that can make an authenticated HTTP request.

#rest api#feature flags#api keys#curl
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Introducing Smart Insights

Smart Insights brings post-release monitoring into the feature flag workflow so teams can move from rollout control to rollout decision-making in one place.

#smart insights#release monitoring#feature flags#rollout health
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Static, Percentage, or Segment?

Three types of feature flags, three different jobs. A quick guide to choosing the right one — with the scenario where each one fits.

#feature flags#percentage rollout#segments#targeting rules
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Ship to 1% of Users First

No matter how good your staging environment is, production will surprise you. Here's how to limit the blast radius with a gradual rollout.

#gradual rollout#canary release#feature flags#progressive delivery
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Stop Using .env for Feature Flags

ENABLE_NEW_CHECKOUT=true looks like a feature flag. It isn't. Here's the difference between config and flags, and why it matters when you're moving fast.

#feature flags#environment variables#runtime control#deployment safety
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What is a Feature Flag?

A feature flag lets you enable or disable a feature at runtime without deploying. Kill switches, gradual rollouts, A/B tests — it all starts here.

#feature flags#feature management#runtime control#release safety
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