Full-Stack AI Engineer - Knowledge Base & RAG

santander; Tuineje; Hybrid; EUR 60,000 - 90,000; Full time

Benefits offered by this job

Hybrid work model

Open Academy access

Competitive rewards

Job summary

Santander is seeking a Full Stack Engineer for the Knowledge Base team to design and deliver secure, scalable applications and APIs that transform enterprise data into trusted knowledge for AI workflows.

Based in Madrid with a hybrid work model, you will collaborate with AI, Data, Cloud, DevOps, Product, and Security squads to ship production-grade capabilities at enterprise scale, focusing on reliability, security, and observability.

Qualifications

• 5+ years in full stack, backend, cloud, platform, or AI engineering.
• Experience building and operating production-grade distributed systems, APIs, or cloud applications.
• Hands-on experience with LLM applications, RAG, semantic search, or intelligent automation.
• Experience in a regulated enterprise environment.

Responsibilities

• Design and build full stack applications, backend services, APIs, and web interfaces for the Knowledge Base Platform.
• Develop data-to-knowledge workflows covering ingestion, chunking, embeddings, metadata, entities, relationships, retrieval, and validation.
• Build RAG and GraphRAG services combining vector search, graph traversal, reranking, grounding, and citations.
• Create secure integrations and tools for AI agents, including MCP-based interfaces.
• Deliver cloud-native solutions on AWS using containers, serverless, and event-driven patterns.
• Apply strong engineering practices across testing, security, observability, CI/CD, reliability, and cost.
• Collaborate across teams and contribute to technical design decisions and platform evolution.

Skills

Python

FastAPI

Django

React

TypeScript

JavaScript

HTML/CSS

AWS

Docker

Kubernetes

CI/CD

APIs

Distributed systems

LLM applications

RAG knowledge

Education

BSc or MSc in Computer Science, Software Engineering, or related field

Tools

Docker

Kubernetes

Infrastructure as Code

AWS Cloud

Job description

Santander is seeking a Full Stack Engineer for the Knowledge Base team to design and deliver secure, scalable applications and APIs that transform enterprise data into trusted knowledge for AI workflows.

Based in Madrid with a hybrid work model, you will collaborate with AI, Data, Cloud, DevOps, Product, and Security squads to ship production-grade capabilities at enterprise scale, focusing on reliability, security, and observability.