Senior AI / LLM Agent Engineer

Department: ENGINEERING

Location: Madrid

Employment Type: FullTime

You'll be core to our product — designing, building, and operating the autonomous agents that power Causa Prima. From invoice validation and dispute resolution to cross-company negotiation and cash optimization.

What you'll do

• Agent architecture — Design the multi-agent system: agent boundaries, event contracts, orchestration patterns, and the separation between LLM reasoning and deterministic enforcement. LLMs inform; rules enforce.

• Document processing pipeline — Ingestion, classification, and structured extraction from financial documents (invoices, contracts, purchase orders) using LLM-based parsing and vision models. Sandboxed processing for untrusted documents.

• Validation & anomaly detection — Business rule checks, three-way matching, pricing discrepancy detection, and anomaly detection across time.

• Integration framework — Gmail, Google Drive, Slack, banking APIs, crypto wallets, and accounting platforms. Auth model, credential lifecycle, data normalization.

• Knowledge graph — Neo4j context graph that captures implicit business knowledge — the “why” behind decisions. Entity extraction, GraphRAG patterns, provenance tracking.

• Multi-LLM strategy — Per-agent model selection, structured output contracts via Pydantic schemas, evaluation framework, fallback strategy.

• Compliance & security — Agents operate within a zero-trust model. You’ll design how agents verify independently against source data, how outbound content is reviewed, and how the system prevents cascading failures from prompt injection.

What we're looking for

• 3+ years experience with Python and/or TypeScript in production.

• Strong systems design thinking — agent boundaries, failure modes, trust boundaries, contract evolution.

• Strong interest and hands-on experience in LLM-powered systems, agent orchestration frameworks (LangGraph, LangChain, or similar), and document AI (LlamaIndex, LlamaParse, or similar).

• Strong opinions about when to use an LLM vs. a rules engine vs. traditional ML — and the courage to defend them.

• Experience designing data pipelines, integration architectures, or event-driven systems in production.

• Security awareness — you think about what happens when untrusted input meets your pipeline.

• Effective use of AI coding tools with strong review skills for LLM integration and auth code.

• Interest in the finance domain — financial workflows, accounting processes, payment systems — is a strong plus.