Author
Jacob Davis
Founder, Lumetra
Jacob is one of two founders of Lumetra, makers of Engram — a durable, explainable memory layer for AI agents over the Model Context Protocol. He works primarily on retrieval architecture, the canonical user-profile pass, and the LongMemEval reproductions that we publish under MIT.
Before Lumetra, Jacob built developer tooling at the intersection of LLMs and structured data. He writes on the Lumetra blog about what actually moved scores on the public benchmarks — and what didn't.
What he writes about
- Hybrid retrieval (BM25 + vector + graph) and reciprocal rank fusion
- Canonical user-profile passes for multi-session reasoning
- Composer prompt design and the v44 prompt (MIT)
- Dedup architecture (text-hash vs. embedding-similarity)
- Benchmark methodology — what reproduces, what doesn't