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, Ll

📌 AI Engineer (Milano)
🏢 TXT GROUP
📍 Milano