Verified data engineering for AI providers

This list covers data engineering for AI providers verified through shipped work, teams that build the pipelines, feature stores, vector stores, and retrieval infrastructure AI systems depend on. Each entry has been reviewed against evidence of delivered engagements: ingestion flows they've stood up, vector store providers they've integrated, feature platforms they've operated, and RAG stacks they've maintained in production. AI data infrastructure providers listed here span specialisations, from streaming and lakehouse work to hybrid retrieval, embedding pipelines, and evaluation tooling. Verification is earned, not purchased, and the review evidence is public on each provider page. Ranked on earned verification level, then record count, then recency. Plan tier is never a ranking input.