Alejandro Perellón López

Java and Spring Boot, my daily foundation.
AI applied with judgment, not as a pitch.

Software developer specialized in Java and Spring Boot backend development, with a solid foundation in systems administration and hands-on experience in RAG, automation, and AI integration.

Java and Spring Boot are my daily foundation: APIs, application architecture, databases, and production deployment. On top of that I bring systems administration — servers, networks, security — and practical AI application, including designing on my own a management platform for a professional firm, with responsibility for its architecture, development, and infrastructure. I care about software that's built well and going deep enough into a problem to actually solve it.

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Guadarrama, Madrid (Spain) On-site, hybrid or remote Driver's license + own vehicle
Alejandro Perellón
const developer = {
  name: 'Alejandro Perellón',
  role: 'Backend',
  focus: ['AI', 'Systems'],
};

Current project

Management platform + document AI

Java · Spring Boot · Local RAG

Java & Spring Boot backend

APIs, architecture, and databases — the backbone of everything I build, from requirements to maintenance.

Applied AI

AI-assisted development and building AI systems: RAG, vector databases, local models.

Systems and networks

Servers, networks, VPNs and security — infrastructure that holds up, not just works today.

Automation

n8n and scripting to remove repetitive manual work from real business processes.

Experience

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Java backend developer & technical lead

Confidential project · May 2026 — Present

Java Spring Boot PostgreSQL Applied AI

Software Developer & IT Systems Administrator | Applied AI

Nattia · November 2025 — Present

Java Spring Boot PostgreSQL MySQL

Projects

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alejandroperellon.es (this site)

My own professional portfolio: static Astro site, bilingual, with full technical SEO (structured data, sitemap, hreflang) deployed on my own infrastructure.

Astro Tailwind CSS TypeScript Zod

Fat & Happy POS

Point-of-sale system for restaurants with a socket-based client-server architecture, validated end to end in a resource-constrained environment.

Java 17 Hibernate 6 MariaDB Sockets

Methodology

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Problem analysis and requirements

I understand the real problem and its requirements before designing anything.

Design and technical decisions

I choose architecture and technologies based on the actual problem.

Audit before the change

I read and extract the existing context before touching anything with real impact.