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Design an A/B Testing Platform is a medium system design interview question covering Distributed Systems, experimentation, statistics, data pipelines — the kind asked at FAANG (Facebook/Meta, Apple, Amazon, Netflix, Google) and AI-first companies like Anthropic, OpenAI, and Nvidia.
Design an experimentation platform running 2,000 concurrent experiments over 100 million daily users, with about 5 million assignment decisions per second. Results must be statistically trustworthy: correct exposure logging, sample-ratio checks, and protection against teams shipping on noise.
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