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829 How LinkedIn replaced five feed retrieval systems with one LLM model, at 1.3 billion-user scale

VentureBeat
VentureBeat · 03/16/2026 00:00 EDT

LinkedIn's feed reaches more than 1.3 billion members — and the architecture behind it hadn't kept pace. The system had accumulated five separate retrieval pipelines, each with its own infrastructure and optimization logic, serving different slices of what users might want to see. Engineers at the company spent the last year tearing that apart and replacing it with a single LLM-based system. The result, LinkedIn says, is a feed that understands professional context more precisely and costs less to run at sc

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