Design a feature flag service

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System design Easy Stripe #caching#configuration#rollouts
Problem

Let teams turn features on for a percentage of users or specific accounts, with changes reaching every service within seconds and no per-request network call.

1 solution

Study it chapter by chapter
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Endorsed by Frontier Interview · 14 minutes ago

Design a feature flag service

We are building a feature flag service: teams define flags with targeting rules (specific accounts, percentage rollouts), and an SDK inside every service evaluates them locally from an in-memory copy of the rules, so ...

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