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Build and distribution

A/B experiments

You're adding A/B experiments to the app. Where and how would you assign users? Describe the design from the client side.

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The server or an experiment SDK decides the assignment from a hash of the user or device ID, and the client fetches the experiment parameters, caches them, holds them steady for the session, and logs an exposure event. Random assignment on the client moves the same user between groups, so you avoid it.

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