Design a Feature Flag Service · System Design Interview

Design a Feature Flag ServiceDesign the service that decides, for every request in every product, whether a given feature is switched on for the person making it.What it has to do

An engineer defines a flag and the rules deciding who gets it

Application code asks whether a flag is on for a user, and gets an answer

A flag turned off now takes effect across the fleet within seconds

Scale

Evaluations per second: 30 million

Flags defined: 50,000

Out of scope

Analysing experiment results

The admin interface

Who is allowed to change a flag

Billing

Practise this challengeAll system design challenges

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