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Design a File Sync Service like Dropbox

Sync files up to 50 GB across devices: presigned multipart uploads, blocks named by hash, a journal per namespace with WebSocket hints, and cold tiers: one-hour boards for junior, senior and staff, with the theory behind them.

file-syncblob-storagemultipart-uploaddeduplicationwebsocketdynamodbawsinterview-board

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Outline of the design layout

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