About the company

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Shalion is a data and insights-driven company that serves world-class manufacturers and brands globally. Through our Digital Shelf Optimization, Retail Media, and Food Service Aggregators solutions, we provide innovative tools for e-commerce monitoring.

At Shalion, we empower brands to make smarter business decisions in eCommerce by delivering actionable data and insights on online product prices, availability, share of search, and more. We operate across 1000+ e-retailers in 60+ countries, serving industry giants such as Heineken, Lego, Danone, Nestlé, and JDE.

As a leader in data intelligence, we specialize in gathering, analyzing, and applying proprietary artificial intelligence to deliver relevant data and monitoring tools, helping our clients maximize their e-commerce performance.

The role
We are looking for a Mid-Level AI Engineer to accelerate our AI engineering efforts at our Barcelona offices.



We want someone with an "agentic" mindset who views LLMs as reasoning engines within a larger architecture, rather than simple text predictors.

Working closely with our AI and Engineering leadership, you will help build advanced AI systems that move beyond standard chat interfaces. Your primary focus will be architecting agentic workflows, governing complex states in LLM systems, and making sure our generative capabilities remain reliable, steerable, and scalable.

Your Responsibilities

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- Design and implement complex, multi-step AI workflows using LangGraph to manage state, loops, and conditional logic.
- Develop, test, and version‑control advanced prompts, Few-shot, Chain-of-Thought, ReAct.
- Build and maintain Retrieval-Augmented Generation, RAG, pipelines, including document parsing, embedding optimization, and vector database management.
- Establish automated evaluation frameworks to measure hallucination rates, groundedness, a

📌 Mid AI Engineer (Barcelona)
🏢 Shalion
📍 Barcelona