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Design a Collaborative Document Editor is a hard system design interview question covering Distributed Systems, real-time collaboration, CRDT, websockets — the kind asked at FAANG (Facebook/Meta, Apple, Amazon, Netflix, Google) and AI-first companies like Anthropic, OpenAI, and Nvidia.
Design a Google Docs style editor: multiple people type in the same document simultaneously, everyone converges to identical content, keystrokes are never lost, local typing is instant, and a user who edited offline for two hours must merge cleanly on reconnect.
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