Backend Engineer – Python / Fast API / 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 .
Envíe su solicitud a continuación después de leer todos los detalles y la información de apoyo sobre esta posibilidad de trabajo.
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 Fast API . Developing typed API schemas with Pydantic and strong typing practices. Building asynchronous backend components and secure endpoints. Developing agentic AI pipelines using Lang Graph and Lang Chain . Implementing workflows for content discovery, matching, editing, validation and evaluation. Integrating Azure Open AI 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, Postgre SQL 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 Fast API . Experience with Pydantic, async Python and typed backend development . Experience with SQLAlchemy and Postgre SQL . Hands-on experience developing LLM applications using Lang Graph and/or Lang Chain . Experience integrating Open AI or Azure Open AI 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. xqbhyrx Technology Stack Python · Fast API · Lang Graph · Lang Chain · Azure Open AI · RAG · FAISS · Pydantic · SQLAlchemy · Postgre SQL · 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.
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📌 Backend engineer – python / fastapi / llm pipelines | 100% remote (Valencia do Sil)
🏢 Infoser New Technologies
📍 Valencia do Sil