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 main requirements are a high volume of local flag checks and prompt delivery of configuration changes to connected clients.

A feature flag lets a team change application behavior without updating the application code. A remote request for each individual flag can make this unnecessarily slow.

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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