ph3About the company /h3 pShalion 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. /p pAt 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. /p pAs 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. /p h3The role /h3 pWe are looking for a bMid-Level AI Engineer /b 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. /p pWorking 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. /p h3Your Responsibilities /h3 ul liDesign and implement complex, multi-step AI workflows using LangGraph to manage state, loops, and conditional logic. /li liDevelop, test, and version‑control advanced prompts, Few-shot, Chain-of-Thought, ReAct. /li liBuild and maintain Retrieval-Augmented Generation, RAG, pipelines, including document parsing, embedding optimization, and vector database management.



/li liEstablish automated evaluation frameworks to measure hallucination rates, groundedness, and relevancy. /li /ul h3Required Qualifications /h3 ul li3+ years in software engineering, with at least 1 year of hands‑on experience building and deploying LLM-based applications in production. /li liDeep proficiency in Python (including async programming, testing, and modern frameworks like FastAPI and Pydantic). /li liExperience with orchestration tools such as LangGraph, Stateful Actors, LangChain, CrewAI, or Vertex AI Agent Builder. /li liDeep understanding of how to manage conversational state and memory in complex, non-linear AI graphs, cycles, nodes, and edges. /li liAbility to treat AI engineering like software engineering, applying CI/CD, unit testing for prompts, structured logging, and observability. /li liProfessional fluency in English and Spanish. /li /ul h3Nice-to-have skills /h3 ul liExperience with LangChain/Langgraph. /li liExperience with prompt engineering and optimization. /li /ul h3What we offer you /h3 ul liAn international team – Work with colleagues from 15+ nationalities. /li liA dynamic and innovative environment – Be part of a high-performing team. /li liHybrid work model – 3 days in-office, 2 days remote. /li liImpactful work – Contribute to a challenging and innovative project. /li liFlexible benefits – allocate part of your gross salary (pre‑tax) to meal vouchers, transport allowance, and private healthcare at a preferential rate. /li liOffice perks – Fresh fruit and specialty coffee daily. /li liContract: Permanent /li liGreat location – Office in Barcelona’s Sarrià‑Sant Gervasi district. /li /ul pShalion Data Services Limited is an equal‑opportunity employer. We celebrate diversity and are committed to creating an inclusive environment for all employees. /p /p #J-18808-Ljbffr

📌 Mid AI Engineer (Barcelona)
🏢 Shalion
📍 Barcelona