Jean Castañeda
@jeancastaeda
Construyo aplicaciones React rápidas, accesibles y orientadas a conversión.
SpainWhat I'm looking for
Construyo aplicaciones web en producción con React y TypeScript para clientes de e-commerce, reformas y servicios profesionales.
En 404studios he diseñado y entregado más de cinco aplicaciones, incluyendo Yimailife, una plataforma B2B con cotización dinámica, Firebase y pruebas E2E con Cypress. También he desarrollado experiencias headless Shopify, landing pages de captación y webs corporativas con resultados Lighthouse superiores a 90.
Me enfoco en interfaces responsive, accesibles y optimizadas para SEO, integrando APIs REST, Firebase, Stripe, SendGrid y flujos de datos asíncronos con TanStack Query. Utilizo Framer Motion y GSAP para crear interacciones visuales que mejoran la experiencia y el engagement.
Actualmente también trabajo en Softek desarrollando suites E2E con Cypress y TypeScript, aplicando Page Object Model, validando flujos críticos y documentando incidencias en Jira. Me apoyo en GitHub Copilot, Cursor y buenas prácticas de CI/CD para entregar código mantenible sin sacrificar calidad.
Experience
Work history, roles, and key accomplishments
Desarrollador Frontend
404studios
Jan 2024 - Present (2 years 8 months)
Designed and delivered over 5 production React/TypeScript applications for clients in sectors such as renovations, e-commerce, and professional services. Developed responsive, mobile-first interfaces with Tailwind CSS and SCSS, achieving Lighthouse scores above 90 in performance.
Education
Degrees, certifications, and relevant coursework
Professional Certificate, Artificial Intelligence
Completed a 7-course program covering research, data analysis, content creation, and AI-assisted programming, with a portfolio of 20+ applied artifacts.
IBM
Certificate, Cybersecurity
Completed cybersecurity training covering vulnerability assessment, network security, cloud infrastructure, and incident response.
IBM SkillsBuild
Certificate, Artificial Intelligence
Implemented practical RAG systems to improve the quality of language model responses.
IBM SkillsBuild
Certificate, Web Development
Completed coursework in web development with Python, covering AI fundamentals, AI literacy, and prompt engineering.
IFCD0210
Certification, Web Development
Completed an accredited 590-hour web development program.
Universidad Bicentenaria de Aragua
Bachelor's Degree, Law
Pursued a law degree.
Availability
Location
SpainAuthorized to work in
Website
404studios.esSalary expectations
Social media
Job categories
Skills
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