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Esteban Castaño

@estebancastao

Fullstack & Backend Developer who delivered a national vehicle fleet control platform with React.js, Spring Boot, and PostgreSQL.

Colombia

Message

At Defensoría del Pueblo, I built and deployed a national vehicle fleet control platform with React.js and Spring Boot backed by PostgreSQL. I designed modular RESTful APIs and optimized database queries to reduce response times for critical administrative operations.

I also developed accessible, responsive UI components for JSConf Spain 2025 and reusable component libraries at No-Country. In my projects, I built a Go microservice integrating the Facturama API and a Flutter interface for mobile electronic invoicing.

Experience

Work history, roles, and key accomplishments

Fullstack & Backend Developer

Defensoria del Pueblo

Aug 2025 - Dec 2025 (4 months)

Built and deployed a national vehicle fleet control platform using React.js and Spring Boot with PostgreSQL. Designed modular RESTful APIs and optimized database queries to reduce response times.

React Spring Boot PostgreSQL REST APIs Scrum Version Control

UI Contributor / Open Source

JSConf Spain 2025

Oct 2024 - Jan 2025 (3 months)

Implemented accessible UI components and responsive layouts for the conference's official website via GitHub Pull Requests.

UI Components Accessibility Responsive Design GitHub Open Source

Teaching Assistant / Programming Tutor

Universidad de Antioquia

Jul 2024 - Dec 2024 (5 months)

Mentored students in software development principles and clean code practices using Java. Guided frontend fundamentals with HTML and standardized development environments using Docker.

Java HTML Docker Mentorship Clean Code

Frontend Developer (Professional Simulation)

No-Country

Feb 2024 - May 2024 (3 months)

Developed responsive and reusable UI component libraries within an international multidisciplinary team using React.js and Tailwind CSS. Resolved cross-browser styling inconsistencies to improve usability and accessibility.

React Tailwind UI Components cross browser compatibility Accessibility