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Julio SosaJS

Julio Sosa

Freelance Developer & Creative Consultant

€330/day
Barcelona, ES
3-7 years

Average response time: 1 hour

About Julio

  • Spanish

    Native or bilingual

  • English

    Native or bilingual

  • French

    Basic

  • Catalan

    Conversational

Can work on-site
Barcelona (up to 50km)

Experience

  • Remote
    Freelance Developer / Independent Consultant
    September 2025 - Today (10 months)
    • • Creating content for clients: editing videos, designing social media posts and strategies.
    • • Building and refining portfolio projects, frontend prototypes, and client-ready UI implementations using JavaScript, HTML, CSS, PHP, and WordPress.
    • • Exploring AI-assisted workflows for design/development productivity.
    • • Delivered company websites / consulting / website improvements / audits / QA / maintenance.
  • Marbill Technologies
    Frontend Software Engineer
    September 2022 - April 2025 (2 years and 7 months)
    • • Developed and maintained large-scale e-commerce frontends using HTML, CSS, JavaScript, Twig, and PHP.
    • • Supported multiple high-traffic e-commerce sites sharing a common technical architecture.
    • • Implemented scalable frontend patterns to separate content from logic, improving long term maintainability and reuse across projects.
    • • Integrated and maintained third-party APIs within the existing framework, ensuring consistency and reliability across environments.
    • • Collaborated closely with backend developers, product owners, and stakeholders to deliver features aligned with both technical and business requirements.
  • Cognizant Netcentric
    Frontend Software Engineer
    September 2021 - August 2022 (11 months)
    Barcelona, Spain
    • • Frontend development for enterprise-level projects built on Adobe Experience Manager (AEM).
    • • Maintained and extended large JavaScript codebases, focusing on stability, readability, and long-term sustainability.
    • • Contributed to testing and quality assurance processes within a structured, enterprise scale development environment.

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Education

  • Master in Visual Arts and Multimedia
    Polytechnic University of Valencia
    2017
    Master in Visual Arts and Multimedia
  • Bachelors Degree in Advertising
    UNIBE
    2012
    Bachelors Degree in Advertising

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