Rahul Raja
Staff Software Engineer at LinkedIn working on large-scale search infrastructure and information retrieval systems, specializing in integrating AI/ML for ranking, semantic search, and retrieval at scale.
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Feb 17, 2026 • 1h 3min
The Future of Information Retrieval: From Dense Vectors to Cognitive Search
Rahul Raja, Staff Software Engineer at LinkedIn who builds large-scale search and retrieval systems, discusses the shift from keyword search to dense, vector-based retrieval. He explores cognitive search, LLM-driven reasoning and personalization, scalability of billions of embeddings, evaluation signals beyond recall, and challenges like embedding drift, access control, and cost-effective infrastructure.
