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

Si desea saber un poco más sobre esta posibilidad, o está considerando presentar su candidatura, por favor, lea la siguiente información del puesto.

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. xugodme

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.

Hay opciones de teletrabajo/trabajo desde casa disponibles para este puesto.

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