Backend developer/Alcobendas, Madrid (Spain)

Javier Mateos

cabrasky [--backend] [--infra] [--data] [--frontend] problem …

Backend developer with a systems background. I like understanding how things work inside, automating the repetitive and building my own tools.

See projects cabrasky@cabrasky.net

cabrasky@www:~$ neofetch

javier@cabrasky

OS: Backend developer
Host: BBVA Technology
Kernel: Java · Spring Boot
Uptime: since 2020
Packages: 10 (personal projects)
Shell: cabrasky 2026.10
Resolution: —
Theme: brasa
CPU: curiosity @ 100%
Locale: Alcobendas, Madrid (Spain)

DESCRIPTION

Understanding how it works

I'm a developer at BBVA Technology, working with master data and Java development on GoldenSource for corporate and investment banking projects.

I come from systems and networking, and it shows: I like understanding the whole chain, from the API down to the disk where the data ends up. Outside work I build tools for the people around me and learn architecture by breaking my own systems.

$ env | grep cabrasky

BACKEND: JavaSpring BootPythonFastAPISQLPostgreSQL
INFRA: KubernetesArgo CDJenkinsDockerLinuxProxmoxnetworking
DATA: GoldenSourcemaster data managementETL
FRONTEND: ReactTypeScriptRemixViteTailwindReact Native

SERVICES

Things I've built

Tools used by me, the people around me or the association I volunteer with. Each one started with a real problem.

$ systemctl list-units --type=service

yambo.slice · volunteering · 2 loaded units

Sep 2022 — present

Youth leisure instructor · Yambo Youth Association ↗

On Friday afternoons I lead groups of children and teenagers aged 4 to 18 in educational leisure activities.

Instructor for groups aged 4 to 18 since September 2022.
I built and maintain the association's website: activities, projects and a members-only area.
I created Pagos Yambo to track the association's invoices, payments and receipts.

yambo.service active (running) · since 2025

Yambo

Website for the Yambo youth association in Alcobendas: activities, projects and a members-only area.

Remix
Tailwind
Spring Boot

yambo.cabrasky.net

pagos-yambo.service active (LAN only) · since 2026

Pagos Yambo

Tracks invoices, payments and receipts for a non-profit. TypeScript core with swappable adapters (Google or local). It started as an Apps Script.

TypeScript
Hexagonal
React

LAN · private

peculio.service active (running) · since 2026

Peculio

Personal and shared expense tracking: income, goals, subscriptions and stats. Web, API and Android app.

React 19
FastAPI
Expo

github.com/cabrasky/peculio-app

3 loaded units.

side projects (7)

discord-status VS Code extension that shows on Discord what you're coding. TypeScript
thermal-ticket-printer npm package for thermal receipt printers from Node or the browser. Node.js
table2taste Final project of my web development degree: restaurant bookings and management. Spring Boot
SEO Hub Unified SEO management (Search Console, Bing, IndexNow) for multiple users. TypeScript
Cuentas Claras Mobile app to split expenses among friends. React Native
rf-command-manager Home Assistant integration to manage Broadlink RF/IR commands from a custom panel. Python
CGE Cabrasky Game Engine: a game engine in C, built to learn. C

HISTORY

$ git log --graph --oneline --all

Data Management & Java Developer

May 2025 — present · BBVA Technology · Madrid (hybrid)

Master data management and Java development on GoldenSource for CIB projects.
IT Support Technician

Feb — May 2025 · Sermicro · Alcobendas

Systems administration and support.
Java Software Developer

Apr — Jun 2024 · Metrica Consulting · Madrid

Application development.
Youth leisure instructor

Sep 2022 — present · Yambo Youth Association
|/
Higher Vocational Degree in Web Application Development

2022 — 2024 · IES Ciudad Escolar
Vocational Degree in Microcomputer Systems and Networks

2020 — 2022 · IES Virgen de la Paz · GPA 8.18/10

Skills

Backend: Java · Spring Boot · Python · FastAPI · SQL · PostgreSQL
Infra: Kubernetes · Argo CD · Jenkins · Docker · Linux · Proxmox · networking
Data: GoldenSource · master data management · ETL
Frontend: React · TypeScript · Remix · Vite · Tailwind · React Native

Experience

Data Management & Java Developer · BBVA Technology, Madrid (hybrid)

May 2025 — present

Master data management and Java development on GoldenSource for CIB projects.

IT Support Technician · Sermicro, Alcobendas

Feb — May 2025

Systems administration and support.

Java Software Developer · Metrica Consulting, Madrid

Apr — Jun 2024

Application development.

Projects

Yambo · yambo.cabrasky.net

Remix · Tailwind · Spring Boot

Website for the Yambo youth association in Alcobendas: activities, projects and a members-only area.

Peculio · github.com/cabrasky/peculio-app

React 19 · FastAPI · Expo

Personal and shared expense tracking: income, goals, subscriptions and stats. Web, API and Android app.

Pagos Yambo

TypeScript · Hexagonal · React

Tracks invoices, payments and receipts for a non-profit. TypeScript core with swappable adapters (Google or local). It started as an Apps Script.

Other projects

discord-status (TypeScript) — VS Code extension that shows on Discord what you're coding.
thermal-ticket-printer (Node.js) — npm package for thermal receipt printers from Node or the browser.
table2taste (Spring Boot) — Final project of my web development degree: restaurant bookings and management.
SEO Hub (TypeScript) — Unified SEO management (Search Console, Bing, IndexNow) for multiple users.
Cuentas Claras (React Native) — Mobile app to split expenses among friends.
rf-command-manager (Python) — Home Assistant integration to manage Broadlink RF/IR commands from a custom panel.
CGE (C) — Cabrasky Game Engine: a game engine in C, built to learn.

Education

Higher Vocational Degree in Web Application Development · IES Ciudad Escolar

2022 — 2024

Vocational Degree in Microcomputer Systems and Networks · IES Virgen de la Paz, GPA 8.18/10

2020 — 2022

Volunteering

Youth leisure instructor · Yambo Youth Association, Alcobendas