SIX drives the transformation of financial markets.

What sets us apart drives us ahead: between local roots and general relevance, we are a unique blend of tradition and future, of foundation and growth. We value bright minds and inspire them to grow with their ideas. Come and shape the future of finance with us.

AI Engineer

Madrid, Warsaw | Working from home up to 40% | Reference 7655

Join us in shaping the future of financial information. This is a high-leverage, player-coach role at the heart of how we scale AI delivery. You will set the technical direction for production-grade AI solutions. If you are passionate about agentic AI, enjoy solving hard engineering problems, and want to see your work used daily by real users in a critical products, this is a unique opportunity to have a tangible impact from day one.

What You Will Do
- Architect Multi-Agent Systems: Design, build, and orchestrate complex agentic workflows using LangGraph and LangChain to handle sophisticated financial queries and agents.
- Productize AI & GenAI Solutions: Build the backends,



agent/RAG infrastructure, MCP servers, and LLM-serving layers that turn models, prompts, and pipelines into reliable, observable production products.
- Champion Quality & Coach Peers: Apply clean architecture and proven design patterns, enforce standards through tests and reviews, and coach junior engineers and rotating contributors.
- Implement Advanced RAG: Build and optimize Retrieval-Augmented Generation systems to ground model responses in proprietary data.
- Establish Evaluation Pipelines: Create rigorous testing frameworks and metrics to evaluate agent performance, reliability, and accuracy in a production environment.

What You Bring
- Core AI Engineering Stack: Deep expertise in Python and the modern AI stack, including LangChain, LangGraph, OpenAI SDK, and Hugging Face Transformers. Strong ability to debug and optimize multi-agent workflows, with a focus on asynchronous execution, state management, a

📌 AI Engineer (España)
🏢 Six
📍 España