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Comment on Ask HN: Do you use a feature flag system? What does it look like?

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If you are at an engineer-driven company a couple of utility functions "if ff_isset(ff_name)" one for backend and one for frontend might be all you need. You select the FF by setting a cookie. You can have a simple dashboard to set them and show the data.

Most companies seem to prefer launchdarkly or similar, but I have seen this setup work great at big international websites with loads of traffic.

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