The Prompt That Filters Greenfield Preparation Somewhere in the middle of many senior loops, the interviewer abandons the clean-slate prompt and reaches for a different weapon: "We have a ten-year-old monolith handling checkout. Walk me through moving payments to its own service — without downti...

Source: [Dev.to](https://dev.to/atlantean_2491f7a3c49cea7/brownfield-system-design-interviews-how-to-answer-migration-and-legacy-questions-3k8c)

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