Frontier Agentic AI Engineer — Hybrid & Cutting-Edge

Banco Santander; Madrid; Hybrid; EUR 90,000 - 130,000; Full time

Benefits offered by this job

Hybrid working model

BeHealthy wellness program

Childcare support

Meal subsidy

Shuttle service in Madrid

Job summary

Santander AI Lab is seeking an Frontier Agentic AI Engineer in Madrid. You will design and deploy production-grade agentic AI systems, coordinate multi-agent orchestration with real memory and planning, and work with researchers and stakeholders to deliver bank-focused AI solutions.

You will fine-tune models for regulated banking tasks, build scalable APIs, and ensure robust, observable deployments in cloud environments. Hybrid work options are available.

Qualifications

• 4–8 years of software engineering or AI engineering experience.
• 2+ years building and maintaining LLM-powered systems in production.
• Hands-on experience designing and deploying multi-agent AI systems.
• Experience fine-tuning/adapting language models (SFT, LoRA, RLHF).
• Portfolio of production-ready code and end-to-end delivery.

Responsibilities

• Design, build and deploy production-grade agentic AI systems with multi-agent orchestration.
• Fine-tune language models for banking use cases and build evaluation frameworks.
• Architect MCP servers, A2A protocols and federated API layers for cross-country use.
• Prototype new ideas in two-week sprints with end-to-end demos.
• Collaborate with researchers and stakeholders to translate tech into bank value.
• Evaluate emerging tools and integrate them where value is added.
• Produce clean, observable code for the AI Science team.

Skills

AI engineering

Multi-agent systems

REST APIs

Python

Cloud infrastructure

Model fine-tuning

Production-grade code

Decent autonomy

Education

Bachelor’s or Master’s in CS/SE

Master’s in AI/ML (preferred)

Tools

LangGraph

AutoGen

CrewAI

Semantic Kernel

FastAPI

Docker

Kubernetes

AWS Bedrock/SageMaker

Langfuse/Promptfoo

Job description

Santander AI Lab is seeking an Frontier Agentic AI Engineer in Madrid. You will design and deploy production-grade agentic AI systems, coordinate multi-agent orchestration with real memory and planning, and work with researchers and stakeholders to deliver bank-focused AI solutions.

You will fine-tune models for regulated banking tasks, build scalable APIs, and ensure robust, observable deployments in cloud environments. Hybrid work options are available.