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How do AI companies build web crawlers?
AI companies that train search, recommendation, or language models need a steady stream of fresh pages, feeds, and files from the public internet. That work is done by crawlers: distributed systems that fetch content, discover new URLs, and revisit known pages to detect updates. Building a crawler that runs continuously is less about a single “bot” and more about orchestration, scheduling, data hygiene, and resilience.
Written byAnnie Hayes
Published onDecember 19, 2025
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