System design interview question
"Design a CI/CD system. Developers push code; it gets built and tested; artifacts are produced; and then deployed to thousands of servers across multiple regions. Hundreds of deploys a day. Tell me how you make deployment safe — because the dangerous part is not building, it is releasing."
safe progressive rollout and fast rollback, plus artifact management. The distinguishing insight is that the hard problem is not distributing bits — it is limiting the blast radius of a bad change and detecting it before it reaches everyone. Candidates who focus entirely on build pipelines have missed the risk.
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