Job Overview
We are building AI‑powered products that transform how business teams generate strategic insights. Join our expert team to work on a Pharmaceutical sector product, contributing to the development of an AI platform that transforms enterprise knowledge into intelligent decision support.
You will apply your knowledge of LLMs, RAG, knowledge graphs and cloud‑native technologies to build scalable AI solutions that enable business teams to make better evidence‑based decisions through Synthetic AI Personas.
At ERNI you are part of the team regardless of whether you work on an external project – you will always be supported.
Responsibilities
You will design and develop AI‑powered capabilities based on LLMs, RAG and Synthetic AI Personas, building scalable backend services and enterprise integrations. You will collaborate closely with product owners, architects and engineering teams to transform business requirements into reliable AI solutions, and continuously improve quality, performance and scalability.
Qualifications





Strong software engineering experience building production‑grade applications using Python as the primary language, with additional experience in TypeScript, Node.js, FastAPI, Java or Rust.
Hands‑on experience developing LLM‑powered applications using Azure OpenAI, OpenAI, Azure AI Services, Amazon Bedrock, Gemini or Anthropic, including multi‑provider LLM orchestration.
Proven experience designing RAG and GraphRAG solutions, working with knowledge graphs, embeddings, vector search, semantic chunking, retrieval optimisation and processing structured and unstructured enterprise data.
Experience implementing agentic AI workflows using frameworks such as LangChain, LangFuse or Haystack, including prompt orchestration, tracing, evaluation and observability.
Strong experience designing cloud‑native microservices and APIs, working with Snowflake, PostgreSQL, Docker, OpenShift, Kubernetes and modern CI/CD pipelines, while collaborating effectively wit

📌 Senior Full Stack AI Engineer/LLM (Madrid)
🏢 Erni
📍 Madrid