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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
.

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Location:
Spain

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Work model:
100% Remote

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Environment:
International team

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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
Lang

📌 Backend Engineer – Python (España)
🏢 Infoser Technological Solutions, Hardware, Big Data Experts
📍 España