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Design a Configuration Distribution and Rollout System is a hard low-level design interview question covering operational design, sre, devops, configuration management, deployment — the kind asked at FAANG (Facebook/Meta, Apple, Amazon, Netflix, Google) and AI-first companies like Anthropic, OpenAI, and Nvidia.
Design how configuration reaches a fleet of services: feature flags, timeouts, connection limits, traffic weights and allow-lists. Changes should take effect within a minute or two without a deploy. Every postmortem starts by asking what changed, so changes must be attributable and reversible. Decide how a bad value is prevented from reaching production, what a service does when it cannot fetch its configuration at startup, and what happens if a configuration change breaks the mechanism that distributes configuration.
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