System design interview question
"Design Google Photos. Users' phones automatically back up every photo and video they take, forever. They can search their library by content — 'beach', 'my dog', 'receipts' — without ever tagging anything. 1 billion users."
continuous background sync plus content-derived search. This is not Instagram: there is no feed, no social graph, and the defining features are (1) an always-on sync client that must handle interruption, duplication and multi-device, and (2) search over content nobody labeled, which means an ML enrichment pipeline whose output is a per-user index.
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