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 .
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

📌 Backend engineer – python (Valencia do Sil)
🏢 Infoser New Technologies
📍 Valencia do Sil