Design a RAG-as-a-service platform that lets teams build retrieval-augmented apps over their own data.

Offering RAG as a product means handling messy ingestion, multi-tenant isolation, and per-customer index freshness, all behind a simple API. Learn the ingestion and query planes, how to keep tenants isolated, and how to give customers eval and observability.

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