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? Backend Engineer – Python / FastAPI / LLM Pipelines | 100% RemoteWe 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 requiredWhat 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 StackPython · FastAPI · LangGraph · LangChain · Azure OpenAI · RAG · FAISS · Pydantic · SQLAlchemy · PostgreSQL · AWS Aurora · Docker · ECS/Fargate · pandas · XML · pytestIf 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 (Lugo)
🏢 Infoser New Technologies
📍 Lugo