Retrieval-augmented generation systems that ground AI responses in your documents, data, and knowledge. Document ingestion pipelines parse PDF, DOCX, HTML, and plain text, split content into semantically coherent chunks (512-1024 tokens with 10-15% overlap), and generate embeddings using OpenAI text-embedding-3-large or Cohere embed-v3 depending on retrieval quality benchmarks on your dataset. Vector storage in Pinecone, Weaviate, Qdrant, or pgvector (PostgreSQL extension), database selection driven by your existing infrastructure, query volume, and metadata filtering requirements. Hybrid search combines dense vector search with BM25 keyword scoring (Weaviate's built-in hybrid, or Elasticsearch for high-volume deployments) to recover precision lost when queries use exact terminology that embeddings generalise over. Re-ranking via Cohere Rerank or a cross-encoder model scores retrieved chunks against the query before context assembly, reducing irrelevant context injected into the LLM prompt. Retrieval evaluation using RAGAS: context precision, context recall, answer faithfulness, and answer relevance measured against a golden dataset before production deployment, with regression testing on each prompt or embedding model change. Metadata filtering on vector queries (document type, date, department, access tier) ensures retrieval respects your access control model. See RAG Pipeline Development and Vector Database Development.