Grokking Modern API Design Interview
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Interview Question: Design a Feature Flag API

The interview question is:

Design a Feature Flag API.

The pressure is enormous read volume plus a change that must reach every connected client within seconds.

A feature flag lets a team change application behavior without shipping new calling code. That sounds like a key-value lookup. The lookup shape is the mistake.

If a screen checks forty flags and the API exposes one call per flag, the screen makes forty network round trips. If those calls happen at different times, the screen may combine values that were never one valid configuration

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