Skip to main content

Hey, I'm Daniel

Senior Full-Stack Engineer
& AI Engineer

Computer Engineer & MSc in Artificial Intelligence. I build enterprise products and scalable AI solutions that run in production — not prototypes. From distributed systems and cloud architecture to LLM pipelines and multi-agent systems: real engineering, built to last.

Computer EngineerMSc Artificial IntelligenceCloud ArchitectTech Lead
Daniel De Santiago

7+

Years of experience

AWS Certified

Solutions Architect

About

Enterprise products. Production AI. Real engineering.

7+

Years of experience

9+

Enterprise projects led

5M+

Digital assets managed

3

Cloud certifications

Open to opportunities

I'm a Computer Engineer with a Master's in Artificial Intelligence and 7+ years building complex products end-to-end — from distributed backend systems and cloud infrastructure to high-traffic frontends deployed at the scale of El Corte Inglés, Nissan, and Grupo Prisa.

I integrate AI where it solves real problems: RAG systems over terabytes of enterprise content, production multi-agent architectures with LangGraph and MCP, and LLM pipelines that operate inside real business systems — not sandboxes. The difference between a demo and a solution is engineering discipline, and that's what I bring.

I work across Tech Lead, Solutions Architect, and Senior Developer roles — defining architecture, leading teams, shipping products, and communicating directly with clients. My background in both Computer Engineering and AI means I understand the full picture: systems that scale, and intelligence that works.

Tech LeadSolutions ArchitectSenior DeveloperAI Engineer

Expertise

What I do

End-to-end engineering across the full product lifecycle — from architecture to delivery.

Full-Stack Product Engineering

React, Next.js, Node.js, NestJS, GraphQL. End-to-end product ownership from database schema to polished UI — with performance, scalability, and maintainability built in.

AI Agents & LLM Pipelines

Multi-agent systems with LangGraph and MCP, RAG architectures with semantic retrieval, intelligent automation with n8n — deployed in production enterprise environments.

Cloud Architecture

AWS, Azure, GCP. Serverless, microservices, CI/CD, container orchestration. Certified AWS Solutions Architect designing and presenting proposals to enterprise clients.

Enterprise Migrations

Legacy system modernization, monolith-to-microservices, API gateway design, cross-border integrations between banking and retail systems at enterprise scale.

Frontend Architecture & Design Systems

Component library development with Storybook, TypeScript-first design systems, scalable frontend architecture adopted across engineering teams in large organizations.

Financial & Critical Systems

High-availability architecture for interbank transaction processing, banking API integrations, and mission-critical systems where reliability is non-negotiable.

Selected Work

Case studies

Real enterprise projects across retail, media, automotive, banking, and AI.

E-commerce · Enterprise

El Corte Inglés — Digital Commerce Platform

Worked on one of Spain's largest digital commerce platforms for El Corte Inglés group — building high-performance product catalog experiences, checkout flows, and CMS-driven pages used by millions of Spanish consumers.

Millions of users · Spain's largest department store group

Next.jsReactTypeScriptNestJSE-commerceCMS
AI · Media Intelligence

Grupo Prisa — RAG Knowledge System

Designed a Retrieval-Augmented Generation system for Grupo Prisa (El País, Cadena SER, AS) to semantically index and query terabytes of media content — enabling intelligent search and knowledge retrieval across one of Spain's largest media archives.

Terabytes of content indexed · Major Spanish media group

LangChainpgvectorPineconeOpenAIRAGPython
Platform Engineering

Enterprise Digital Asset Management

Architected a DAM platform for a major enterprise group to centralize, process, and distribute 5M+ digital assets across all brand properties — with AI-powered image retouching endpoints and Kafka-based event processing.

5M+ assets · AI processing · Multi-brand distribution

NestJSAzure BlobKafkaMongoDBAIMicroservices
Architecture

Grupo Prisa — Monolith Migration

Helped define and lead the architecture strategy for decomposing Grupo Prisa's legacy monolith into independent microservices — designing service boundaries, data ownership, communication patterns, and a migration roadmap for their engineering teams.

Architecture defined · Cross-team alignment

MicroservicesNestJSKafka+3
Financial Systems · Santander

Santander — Cross-Border API Gateway

Delivered a critical Germany–Spain unified API gateway for Banco Santander — migrating legacy endpoints to node-red orchestration and bridging cross-border financial infrastructure between legacy and modern banking systems at scale.

Germany · Spain · Live Santander banking traffic

Node.jsnode-redREST APIs+2
Frontend Architecture

Corporate Design System

Led the development of a shared component library (Storybook + TypeScript) adopted as the single source of truth for UI across all engineering teams in a large enterprise group — covering tokens, patterns, and documentation.

Org-wide adoption · All teams standardized

StorybookReactTypeScript+2
E-commerce · Fashion

Sfera — Brand Website Rebuild

Led the complete end-to-end rebuild of the Sfera fashion brand website — new product catalog, checkout flow, and CMS integration for one of Spain's leading retail fashion brands.

Full rebuild · National retail brand · Live in production

Next.jsReactNestJS+2
Automotive · Web

Nissan — Apps & High-Traffic Web

Built and scaled web applications and digital experiences for Nissan Motor — including consumer-facing apps and marketing platforms visited by hundreds of thousands of users globally, with SSR for performance and SEO.

Hundreds of thousands of users · Global scale · Automotive

Next.jsReactVue.js+3
Retail · Point of Sale

TPV In-Store Application

Developed a web-based Point of Sale application running on in-store TPV terminals — handling real-time product lookup, cart management, and transaction flows in a demanding retail environment.

In-store deployment · Real-time transactions

ReactTypeScriptNode.js+2
AI Systems

Multi-Agent Engineering Assistant

Built specialized LangGraph + MCP agents with persistent memory and project-specific tooling — embedded in real enterprise engineering teams to reduce repetitive work and accelerate delivery.

Production deployment · Real team adoption

LangGraphMCPLangChain+2
Conversational AI

Enterprise AI Chatbots

Designed and deployed conversational chatbots for enterprise clients — connecting OpenAI and Claude APIs with internal business systems, knowledge bases, and CRMs through n8n serverless pipelines.

Multi-client · CRM & KB integration · Serverless

LangChainOpenAIClaude+3

Tech Stack

Tools I work with

A refined set of technologies I use in production — nothing speculative.

All skills at a glance

React
React
Next.js
Next.js
Vue.js
Vue.js
Nuxt
Nuxt
TypeScript
TypeScript
JavaScript
JavaScript
Tailwind
Tailwind
Sass
Sass
Redux
Redux
HTML5
HTML5
CSS3
CSS3
Storybook
Storybook
Node.js
Node.js
Python
Python
NestJS
NestJS
Django
Django
Express
Express
GraphQL
GraphQL
FastAPI
FastAPI
MongoDB
MongoDB
PostgreSQL
PostgreSQL
MySQL
MySQL
Redis
Redis
Oracle
Oracle
AWS
AWS
Azure
Azure
GCP
GCP
Docker
Docker
Git
Git
GitHub
GitHub
Firebase
Firebase
Webpack
Webpack
Jest
Jest
Figma
Figma
VS Code
VS Code
Linux
Linux

By category

ReactNext.jsVue 2/3NuxtTypeScriptJavaScriptTailwind CSSSass/SCSSReduxStorybookHTML5CSS3

35+

Technologies in production

7+

Years hands-on

3

Cloud providers certified

3

LLM APIs integrated

Experience

Career trajectory

From developer to architect to tech lead — across three countries and four industries.

Tech Lead & Senior Full-Stack Developer

Current

Hiberus Tecnología

Sep 2023 – Present

Madrid, Spain

  • Led 9+ simultaneous enterprise projects with full ownership of architecture, delivery, and client relationships — for Spain's largest retail group and a top European bank.
  • Built the Sfera e-commerce platform from scratch: complete Next.js + NestJS rebuild of a major Spanish fashion brand's digital commerce experience.
  • Architected a Digital Asset Management platform (NestJS + Azure + Kafka) managing 5M+ assets with AI-powered image processing.
  • Executed monolith-to-microservices migrations across legacy enterprise codebases, improving deployment velocity and team scalability.
  • Delivered a Germany–Spain API gateway for Banco Santander — connecting legacy financial infrastructure with modern systems via node-red orchestration.
  • Led the corporate component library and design system adopted by all engineering teams in the enterprise group.
  • Built production LangGraph + MCP multi-agent systems and enterprise AI chatbots connecting LLMs to internal business systems.
ReactNext.jsNestJSAzureKafkaLangGraphMCPMongoDB

Senior Full-Stack Developer & Solutions Architect

Nissan Motor

Jan 2021 – Jul 2023

Mexico / United States

  • Built high-traffic web applications at global scale with React, Next.js, and Vue.js — SSR for SEO and performance.
  • Designed scalable cloud infrastructure and CI/CD pipelines handling thousands of concurrent users globally.
  • Acted as Solutions Architect on internal innovation projects, defining stack and architecture patterns.
ReactNext.jsVue.jsTypeScriptPythonAWSCI/CD

Solutions Architect

PROSA – Interbank Clearinghouse

Feb 2020 – May 2021

Mexico

  • Designed end-to-end solutions for high-availability interbank transaction processing at one of Mexico's largest financial clearinghouses.
  • Analyzed scripts, databases, and process flows; built technical diagrams for robust, high-availability implementations.
CC++JavaMySQLOracleBase24

Full-Stack Developer

Chamber of Deputies of Mexico

Feb 2018 – Jan 2020

Mexico

  • Developed and maintained large-scale institutional applications delivering new features under Agile/Scrum methodology.
React.jsPythonJavaScriptHTMLCSS

Certifications

Credentials

AWS Solutions Architect

Associate

Amazon Web Services

Azure Fundamentals

AZ-900

Microsoft Azure

AWS Cloud Practitioner

Foundational

Amazon Web Services

MongoDB for Developers

Professional

MongoDB University

MongoDB for DBAs

Professional

MongoDB University

Education

M.Sc. Artificial Intelligence

UNAM · 2020 – 2022

B.Eng. Computer Engineering

UNAM · 2017 – 2020

Contact

Let's build something.

Open to senior engineering roles, tech lead positions, solutions architecture, and consulting engagements. Available for remote / international opportunities.

Location

Madrid, Spain

Open to international remote, freelance & consulting