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Juan Sebastián Fernández

Frontend Developer

Córdoba, Argentina

Frontend Developer con 2+ años construyendo interfaces responsivas, landing pages y e-commerce con HTML5, CSS3/SASS y JavaScript ES6+. Enfocado en performance (Core Web Vitals), accesibilidad (WCAG 2.1) y código limpio y mantenible. En formación activa en React. Inglés B2 con comprensión auditiva nativa.

Notable Projects

Greenset Court

Landing de conversión real para cliente: arquitectura modular, parallax, slider y contadores animados con Intersection Observer. Formulario de calificación de leads con envío directo a WhatsApp vía JavaScript. Assets en WebP, deploy continuo vía GitHub + Vercel.

HTML5, CSS3, JavaScript ES6+, Vercel

Festival de Música Web

Landing responsiva con score Lighthouse optimizado, lazy loading y assets en WebP. Mobile-first y semántica HTML5.

SASS/SCSS, WebP, Lighthouse

Frontend Mentor Challenges

Uls pixel-accurate de componentes reales: cards, formularios y layouts complejos. Repositorios documentados y deployados.

HTML5, CSS3, JavaScript, Netlify

Frontend Mentor Challenges

Uls pixel-accurate de componentes reales: cards, formularios y layouts complejos. Repositorios documentados y deployados.

HTML5, CSS3, JavaScript. Netlify

Real Estate Website

Aplicación full-stack en desarrollo: interfaz web conectada a base de datos MySQL, gestión vía CLI.

PHP, MySQL, Full-Stack, CLI

Community Projects

Open-source projects built collaboratively with the developer community.

Leading

landing page de conversion

Open

filtrado de leads para consultas rapidas y de experiencia de usuario agradable

javascript react

Highlights

Multi-Project Contributor

Active contributor across 10+ repositories.

Experienced Professional

15+ years of professional experience.

Community Leader

Leading 1 community project(s) — building and guiding teams.

GitHub Stats

Public Repos

Stars Received

Followers

100

Recent Commits

Recent Pull Requests

Recent Code Reviews

Developer Growth

Contribution Activity

Less

Projects

Seba-fernandez/Greenset-Landing

Greenset-Landing is likely a landing page for a company or project related to "Greenset."

3 total commits (100% of commits) 0 total PRs

CSS 40.5% HTML 42.6% JavaScript 17%

3 commits/month Since Mar 2026 Last active 2 weeks ago

Seba-fernandez/portfoliojuansebastian

This repository likely hosts Juan Sebastian's personal portfolio website.

18 total commits (100% of commits) 1 total PRs (0% of PRs)

CSS 44.2% HTML 45.6% JavaScript 10.2%

18 commits/month Since Mar 2026 Last active 6 days ago

Seba-fernandez/CRM-de-Alquileres-de-vajilla

A CRM system for managing customer relationships and rental operations for tableware businesses.

9 total commits (100% of commits) 0 total PRs

CSS 16% HTML 1.5% JavaScript 82.5%

9 commits/month Since Apr 2026 Last active 1 week ago

Seba-fernandez/Checklist-para-Oratoria

This repository likely provides a checklist for public speaking or oratory preparation.

7 total commits (100% of commits) 0 total PRs

CSS 1.4% HTML 0.7% JavaScript 97.9%

7 commits/month Since Apr 2026 Last active 3 weeks ago

Seba-fernandez/skills-introduction-to-github

This project likely introduces GitHub skills to beginners through practical examples and exercises.

5 total commits (60% of commits) 1 total PRs (100% of PRs)

3 commits/month Since May 2025 Last active 1 year ago

Seba-fernandez/vajilla-crm

Likely a CRM (Customer Relationship Management) system for managing dinnerware or tableware (vajilla).

2 total commits (100% of commits) 0 total PRs

CSS 15.5% HTML 1.3% JavaScript 83.1%

2 commits/month Since Apr 2026 Last active 3 weeks ago

Seba-fernandez/api_biblioteca

A REST API for managing a library's books, authors, and related data.

5 total commits (0% of commits) 0 total PRs

JavaScript 100%

Since Jul 2023 Last active 2 years ago

Seba-fernandez/FestivaldeMusica

Likely a website or application related to a music festival, possibly providing information and features.

3 total commits (100% of commits) 0 total PRs

CSS 29.8% HTML 17.8% SCSS 35.9%

3 commits/month Since Mar 2026 Last active 1 month ago

Seba-fernandez/BlogCafe

A blog platform focused on coffee, likely with articles and community features.

2 total commits (100% of commits) 0 total PRs

CSS 15.5% HTML 84.5%

2 commits/month Since Mar 2026 Last active 1 month ago

Seba-fernandez/API_hola_mundo

Likely a basic API example showcasing a "Hello, world!" implementation.

1 total commits (100% of commits) 0 total PRs

JavaScript 100%

1 commits/month Since Jan 2024 Last active 2 years ago

Technologies

Languages

HTML5 Advanced CSS3 Advanced JavaScript ES6+ Advanced PHP Beginner SASS/SCSS Advanced Semantic HTML5 Intermediate

Frameworks

React Intermediate Node.js Intermediate

Tools

Lighthouse Intermediate Git Intermediate GitHub Intermediate Figma Intermediate Chrome DevTools Intermediate Responsively Intermediate IA Tools Intermediate

Databases

SQL Beginner MySQL Intermediate MongoDB Beginner

Cloud

Vercel Intermediate Netlify Intermediate

IDEs

VSCode Intermediate

Other

Responsive Design Advanced Flexbox Intermediate CSS Grid Intermediate BEM Intermediate DOM Intermediate CSS Animations Intermediate Core Web Vitals Intermediate Lazy Loading Intermediate WebP Intermediate Asset Compression Intermediate Mobile-First Intermediate WCAG 2.1 Intermediate ARIA Intermediate Cross-Browser Compatibility Intermediate SEO On-Page Intermediate REST APIs Intermediate

Education

Desarrollo con Inteligencia Artificial

MoureDev

N/A

2026 – 2026

Introducción al Desarrollo Backend con Node.js

UTN - Facultad Regional Córdoba

N/A

2022 – 2023

Curso Intensivo de HTML y CSS

Midulive

N/A

2022 – 2023

Desarrollo Web Full-Stack

Udemy

N/A

2023

Spoken Languages

Español Native

Inglés Intermediate

Experience

Frontend Developer

Freelance Desarrollo Independiente

Diseñé y desarrollé sitios responsivos, landing pages y e-commerce con HTML5, CSS3/SASS y JavaScript ES6+ para clientes reales. Apliqué performance optimization en cada proyecto: WebP, lazy loading, compresión de assets y auditorías con Lighthouse. Implementé accesibilidad web (WCAG 2.1), ARIA, HTML5 semántico y cross-browser compatibility como práctica estándar. Workflow con Git/GitHub, CI/CD en Vercel, inspección de diseños en Figma y testing responsivo con Responsively.

2022-12 – Present

Vendedor & Gestión Digital

Bagués Cosméticos

Creación de materiales digitales y gestión de redes sociales orientadas a conversión y fidelización de clientes.

2019-01 –

Encargado de Turno

Constructora Jena S.A

N/A

2022-01 –