Lead LLM Engineer — Legal-Tech AI Agent (Paris)

Lead LLM Engineer — Legal-Tech AI Agent (Paris)

Take the technical lead on an AI agent transforming notaries' daily work: document ontology, advanced tool use, autonomous triggers. The Claude Code mindset, applied to real estate law.

• LLM Agents
• Python
• RAG / Knowledge Graph
• LangFuse
• Tool Use / Function Calling

Permanent (CDI): 90 KEUR base + BSPCE (equity, upside on growth)

The context

A leading French notary firm has entrusted us with designing an AI agent that assists notaries in drafting real estate deeds. The goal: reduce document generation time by 60% while ensuring regulatory compliance.

Your missions

• Architect the LLM agent (Claude Sonnet 4.5 + tool use) that consumes a document ontology (RDF/SPARQL) and generates notarial deeds.
• Set up RAG + knowledge graph for French legal context (Code civil, case law).

The profile

• 5+ years in production on LLM/agent projects (Claude, OpenAI, or similar frameworks).
• Strong in Python (strict typing, async, tests).
• Hands‑on experience with tool use, RAG, and continuous evals.
• Knowledge of knowledge graphs (RDF, SPARQL, or similar) a plus.
• Interest in law/legal‑tech: you're not afraid to read a Code civil.
• SEMANTIC observability in prod: you can detect a quality regression (continuous eval, versioned golden dataset, drift detection on new document formats), not just latency/cost monitoring.
• Advanced agentic patterns: graph state interruption/persistence (LangGraph & co) to handle long async tasks without blocking the agent or burning tokens; genuinely multi‑tool, iterating agents.
• Lead posture: you bring the patterns and raise the bar, rather than executing a pre‑made scope.

Daily rate 650-700 EUR based on experience. Start ASAP. 6-12 month renewable mission. Hybrid Paris (54 rue Greneta) + remote.