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Daniel Castro MartinDC

Daniel Castro Martin

Full stack developer

€150/day
Barcelona, ES
3-7 years

Average response time: 1 hour

Freelancer profile translated to English.
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About Daniel

Specializing in e-commerce, online payments, and automation

I am a web developer with experience in PHP, JavaScript, MySQL, and frontend technologies (HTML, CSS, Tailwind, Bootstrap). I build functional, scalable, and business-oriented solutions, especially for B2B and B2C e-commerce, technical integrations, and process automation.

Over the past few years, I have worked with multiple companies developing:

🔹 Advanced payment gateways (Redsys, CCAvenue, Clover/FirstData)
🔹 Integrations with Google Analytics/GA4 focused on conversion
🔹 Multilingual and multi-currency systems (USD/EUR/INR)
🔹 Dynamic generation of catalogs, XML, CSV, and technical files
🔹 Intelligent search engines and advanced filtering
🔹 UX/UI optimization on corporate sites

I am characterized by a clear, direct, and results-oriented approach, prioritizing code quality and understanding the business behind the technology.
  • English

    Native or bilingual

  • Catalan

    Native or bilingual

Remote only
Primarily works remotely

Experience

  • JBCTools,
    Full stack developer
    MECHANICAL ENGINEERING
    June 2024 - Today (2 years)
    Molins de Rei, Spain
    As the web manager at JBC Soldering, I was responsible for:
    • Developing and maintaining the corporate website using PHP, JavaScript, and SQL.
    • Integrating new functionalities and automations between our main domain and WordPress pages.
    • Implementing payment gateways (Redsys, Clover/FirstData) and configuring conversion tracking with Google Analytics 4 (GA4).
    • Improving the user interface and experience (UI/UX) by applying Tailwind CSS, DaisyUI, and Bootstrap.
    • Developing integrations for automated support and user assistance.
    Front-End Development Fullstack Back-End Development HTML5 JavaScript
  • SinIgual
    Full stack developer
    AUTOMOBILE
    September 2023 - June 2024 (9 months)
    Barcelona, Spain
    Reference contact: Albert Garrell (CEO) Letter of recommendation En
    At Sinigual, I was key in the creation of the CRM and development of the main application.
    My responsibilities included:
    -Design of the architecture and responsive front-end.
    -Creation of automated email service.
    -Design and implementation of the back-end.
    -Development and planning of the CRM for our technicians.
    -Implementation of automatic email service for users.
    Angular Fullstack Laravel PHP
  • Payf,
    Full stack developer
    January 2023 - January 2024 (1 year)
    Barcelona, Spain
    As a Full Stack developer, I developed functionalities such as routing, design, data architecture, and API connection for storing biometric data.
    React Native Front-End Development TailwindCSS CSS3

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Education

  • Master's Degree
    NuclioDigitalSchool
    2022
    Máster
  • Minor Front End Development
    2022
    Minor Front End Development

Skill set

Categories