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hardGleanMicrosoftSnowflake

Design per-user permissions for a RAG system over a company's documents. The CEO and an intern ask the same question.

The defining security design problem of enterprise RAG, and the reason Glean exists. Query-time ACL filtering, permission sync lag, and the leakage channels that survive naive designs: caches, citations, and the model itself.

Updated Aug 2026 · Grounded in real Forward Deployed Engineer interview loops and written to a senior-engineer editorial bar.

The defining security design problem of enterprise RAG, and the reason Glean exists. Query-time ACL filtering, permission sync lag, and the leakage channels that survive naive designs: caches, citations, and the model itself.

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