TXT Group is looking for an AI Engineer – LLM & RAG Systems to join our team dedicated to developing cutting-edge Generative AI solutions. The successful candidate will be involved in the design, development and evolution of Agentic AI and Retrieval-Augmented Generation (RAG) systems, contributing to the delivery of reliable, scalable and cost-effective Large Language Model (LLM)-based solutions that address real business needs. Main Responsibilities Design and implement end-to-end agentic systems, including orchestration, intent classification, request routing, and query rewriting and expansion; Define and maintain prompt engineering strategies tailored to different use cases; Select and optimise LLM and embedding models based on quality, latency and cost; Develop ingestion pipelines for unstructured data, including document parsing, cleaning, normalisation, chunking and metadata extraction; Implement embedding generation pipelines and manage vector databases; Design advanced retrieval strategies, including RAG,



hybrid search and reranking techniques; Implement function/tool-calling patterns and integrate external tools (databases, applications, Machine Learning models and web search) using the MCP protocol; Develop entity and relationship extraction processes to build knowledge graphs that enhance retrieval capabilities; Define evaluation metrics and frameworks for RAG and LLM systems, measuring retrieval quality, answer correctness and relevance, hallucination detection, and developing regression testing suites for prompts and pipelines; Design mechanisms to collect and analyse user feedback, supporting offline evaluation and potential model fine-tuning activities. Required Technical Skills At least 2 years of experience developing solutions based on Large Language Models; Strong Python skills and proven experience developing end-to-end LLM-based applications; Experience with LLM and agent orchestration frameworks (such as LangChain, LlamaIndex or equivalent) and

📌 AI Engineer (Milano)
🏢 TXT e-solutions
📍 Milano