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Daniel León EspinosaDL

Daniel León Espinosa

UX Engineer

€300/day
Madrid, ES
8-15 years

Average response time: 1 hour

About Daniel

Desarrollador frontend con 10+ años de experiencia en entornos multinacionales y proyectos de alto impacto para marcas como.Amazon, Durex, Beam Suntory y Let’s Go. Combino un enfoque técnico sólido (React, TypeScript, Redux, SASS) con una obsesión por la experiencia de usuario, accesibilidad (WCAG) y rendimiento web.

¿Qué ofrezco?
✔️ Desarrollo escalable: Arquitecturas modulares y limpias, integración de APIs REST, CMS (Drupal/WordPress) y soluciones headless (Strapi).
✔️ Testing robusto: Prácticas TDD (Jest), tests de integración (Selenium) y optimización de código legacy.
✔️ Colaboración ágil: Experiencia liderando equipos internacionales (Scrum/Kanban) y coordinando workflows fullstack (Java/SQL + frontend).
✔️Resultados tangibles: He elevado métricas de UX en un 40% en proyectos B2B y reducido tiempos de carga en aplicaciones críticas.

Stack técnico
Frontend: React · TypeScript · Redux · SASS · PostCSS · Jest
Backend: Node.js · Firebase · Salesforce (Apex) · SQL
Metodologías: TDD · Clean Architecture · Scrum

Valores diferenciales
- Flexibilidad y compromiso: Adaptación a necesidades cambiantes sin perder foco en los objetivos.
- Comunicación proactiva: Claridad técnica + escucha activa para alinear expectativas.
- Mentalidad de crecimiento: Certificado en Multiplatform Production (UAH) y formación continua en innovación frontend.

¿Buscas un perfil así?
Si necesitas un desarrollador estratégico, con capacidad para resolver desafíos complejos y entregar código mantenible desde el día 1, hablemos.
  • Spanish

    Native or bilingual

  • English

    Fluent

Remote only
Primarily works remotely

Experience

  • Mr. Milu´
    SENIOR FRONT-END DEVELOPER
    January 2021 - December 2024 (3 years and 11 months)
    Madrid, Spain
    • Led development of web applications using React, Redux, and TypeScript following clean architecture and modular design principles.
    • Integrated REST APIs and collaborated with backend teams using CMSs (Drupal, WordPress) and headless solutions (Strapi, Keystone).
    • Implemented UI with SASS, PostCSS and modern CSS techniques.
    • Practiced TDD with Jest and enforced component testing.
    • Ensured cross-browser compatibility and accessibility standards.
    • Contributed to B2B retail platforms and digital campaigns for major consumer brands such as Durex, Amazon, and Beam Suntory, with a strong focus on scalability and user experience.
    Typescript CMS CSS3 Next.js TDD
  • INTELLIT / IQVIA
    SOFTWARE DEVELOPER ANALYST
    January 2016 - August 2020 (4 years and 7 months)
    Madrid, Spain
    • Spearheaded the frontend development of scalable apps in React, Redux, and Sass.
    • Implemented unit and integration tests (Jest, Selenium).
    • Led an international team using Scrum to coordinate frontend and backend workflows.
    • Built web tools to facilitate user interaction across systems, improving UX significantly.
    • Gained experience in Salesforce (Apex), backend testing and performance optimization.
    Jest Salesforce SASS Scrum
  • Indra
    JUNIOR FULLSTACK DEVELOPER
    February 2015 - November 2015 (9 months)
    Madrid, Spain
    • Worked in a large-scale team contributing to both backend (Java, SQL) and frontend (JavaScript, CSS3) development.
    • Gained insight into complex enterprise systems and service-based architectures.
    JavaScript SQL Java

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Education

  • MASTER'S DEGREE IN MULTIPLATFORM PRODUCTION
    UAH
    MASTER'S DEGREE IN MULTIPLATFORM PRODUCTION
  • COMPUTER INGINEER'S DEGREE (120 ECTS)
    UPM
    COMPUTER INGINEER'S DEGREE (120 ECTS)

Skill set

Categories