Juan Sebastián Fernández
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Juan Sebastián Fernández

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

Consistent Contributor

Active for 6 consecutive months — sustained, reliable delivery.

Multi-Project Contributor

Active contributor across 14+ repositories.

Experienced Professional

16+ years of professional experience.

Technology Specialist

3+ years working with JavaScript.

Community Leader

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

GitHub Stats

14

Repositories

0

Stars Received

3

Followers

139

Recent Commits

4

Recent Pull Requests

0

Recent Code Reviews

Developer Growth

Contributions Month

Contribution Activity

Less
More

Projects

139 contributions across 14 repos

Seba-fernandez/

Greenset-Landing

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

6 total commits (633.3% of commits) 0 total PRs
CSS 39.2% HTML 46.9% JavaScript 14%
9.5 commits/month Since Mar 2026 Last active 2 weeks ago
Seba-fernandez/

Grupo-Cespad-actualizacion

Presents a responsive landing page for a company selling and installing premium paddle courts.

23 total commits (100% of commits) 0 total PRs
CSS 35.4% HTML 53.2% JavaScript 11.4%
23 commits/month Since Jul 2026 Last active 4 days ago
Seba-fernandez/

portfoliojuansebastian

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

19 total commits (100% of commits) 1 total PRs (0% of PRs)
CSS 44.2% HTML 45.6% JavaScript 10.2%
9.5 commits/month Since Mar 2026 Last active 2 months ago
Seba-fernandez/

CRM-de-Alquileres-de-vajilla

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

9 total commits (166.7% of commits) 0 total PRs
CSS 16% HTML 1.5% JavaScript 82.5%
15 commits/month Since Apr 2026 Last active 3 months ago
Seba-fernandez/

Portafolio-V2

Seba-fernandez's personal portfolio (V2) designed to showcase their projects, skills, and professional experience.

7 total commits (171.4% of commits) 0 total PRs
CSS 35.2% HTML 32.6% JavaScript 32.2%
12 commits/month Since Jul 2026 Last active 13 hours 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 months ago
Seba-fernandez/

skills-introduction-to-github

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

5 total commits (100% of commits) 1 total PRs (200% of PRs)
2
5 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 (250% of commits) 0 total PRs
CSS 15.5% HTML 1.3% JavaScript 83.1%
5 commits/month Since Apr 2026 Last active 3 months ago
Seba-fernandez/

api_biblioteca

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

5 total commits (100% of commits) 0 total PRs
JavaScript 100%
5 commits/month Since Jul 2023 Last active 3 years ago
Seba-fernandez/

FestivaldeMusica

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

3 total commits (133.3% of commits) 0 total PRs
CSS 29.8% HTML 17.8% SCSS 35.9%
4 commits/month Since Mar 2026 Last active 4 months ago
Seba-fernandez/

BlogCafe

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

2 total commits (150% of commits) 0 total PRs
CSS 15.5% HTML 84.5%
3 commits/month Since Mar 2026 Last active 4 months 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
Seba-fernandez/

QR_Code_Component

Likely generates or displays a QR code component, possibly with customization options.

1 total commits (100% of commits) 0 total PRs
CSS 57.4% HTML 42.6%
1 commits/month Since Jul 2025 Last active 1 year ago
Seba-fernandez/

Results_Table

Likely generates and displays data in a table format using results from some process.

5 total commits (20% of commits) 1 total PRs (200% of PRs)
CSS 50% HTML 50%
1 commits/month Since Jul 2025 Last active 1 year ago

Technologies

Expert in:

JavaScript HTML CSS

Languages

JavaScript Expert · 3 yrs HTML Expert · 1 yrs CSS Expert · 1 yrs

Preprocessors

SCSS Basic · 1 yrs

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 –