Mark Fietje

AI Software Engineer · Open Source · Rust · Knowledge Graphs

I build local-first AI infrastructure. I'm the author of brain-server — a semantic-memory and knowledge-graph server for AI agents — written in Rust, with zero per-query cost and no LLM in the loop.

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What I work on

• Rust — memory servers, retrieval engines, knowledge graphs, vector databases
• AI / ML — semantic search, RAG, embeddings, human-in-the-loop governance
• Product design — functional, accessible, beautiful digital experiences

Featured project

brain-server — a local-first semantic-memory and knowledge-graph server for AI agents. Hybrid RAG retrieval, temporal facts, append-only audit chain, human-in-the-loop governance. Self-hosted, offline-first, zero per-query cost.

Tech stack

Connect

• GitHub: github.com/markfietje
• X / Twitter: @mark_fietje
• LinkedIn: @markfietje

Open to collaboration on AI infrastructure and open-source projects.