? Backend Engineer – Python / FastAPI / LLM Pipelines | 100% Remote We are looking for an experienced Backend Engineer to join an international technology project focused on building an intelligent platform that combines Python backend development, APIs, LLM-based agentic workflows and large-scale data processing. ? Location: Spain ? Work model: 100% Remote ? Environment: International team ?️ English: Good professional working proficiency required What will you be working on? You will help build and operate the Python backend behind an AI-powered platform used to process, compare, update and evaluate complex technical content. Your responsibilities will include: * Designing and maintaining REST APIs using Python and FastAPI. * Developing typed API schemas with Pydantic and strong typing practices. * Building asynchronous backend components and secure endpoints. * Developing agentic AI pipelines using LangGraph and LangChain. * Implementing workflows for content discovery, matching, editing, validation and evaluation. * Integrating Azure OpenAI models using structured outputs and function/tool calling. * Developing RAG-based solutions using embeddings and FAISS. * Implementing grounding, provenance and hallucination-control mechanisms. * Processing engineering datasets and large structured XML documents. * Performing data transformations using pandas and openpyxl. * Developing database integrations using SQLAlchemy 2.x, PostgreSQL and AWS Aurora.



* Containerizing and deploying backend workloads using Docker and AWS ECS/Fargate. * Working with AWS services such as ECR, Secrets Manager, RDS and SSO. * Maintaining automated testing practices using pytest. What are we looking for? * Strong professional experience with Python. * Solid experience developing APIs with FastAPI. * Experience with Pydantic, async Python and typed backend development. * Experience with SQLAlchemy and PostgreSQL. * Hands-on experience developing LLM applications using LangGraph and/or LangChain. * Experience integrating OpenAI or Azure OpenAI APIs. * Knowledge of RAG, embeddings, vector search and structured LLM outputs. * Experience implementing techniques to reduce hallucinations and improve LLM output quality. * Experience processing structured or semi-structured datasets. * Knowledge of Docker and AWS cloud services. * Experience with automated testing using pytest. * Experience with XML processing is highly valued. * Experience with AWS Aurora, ECS/Fargate or RDS Data API is a plus. * Good professional English communication skills. Technology Stack Python · FastAPI · LangGraph · LangChain · Azure OpenAI · RAG · FAISS · Pydantic · SQLAlchemy · PostgreSQL · AWS Aurora · Docker · ECS/Fargate · pandas · XML · pytest If you enjoy working at the intersection of backend engineering, generative AI and cloud-based data processing, we would love to hear from you.

📌 Backend Engineer – Python / FastAPI / LLM Pipelines | 100% Remote (País Vasco)
🏢 Infoser New Technologies
📍 País Vasco