Senior Frontend Developer (JavaScript / Web Components) - Remoto [Spain]

Actio Global; Madrid; A distancia; EUR 45.000 - 70.000; Jornada completa

Descripción de la vacante

Actio Global seeks a Senior Frontend Developer to enhance the migration of legacy code to modern architectures and create high-performance Web Components. This full-time role in Madrid requires a minimum of five years of experience, strong proficiency with Git, and fluent Spanish and English, with opportunities to influence major industry clients.

Servicios

Direct impact on strategic projects

Access to C-suite executives

Opportunity for technology development

Competitive salary with growth potential

Formación

• At least 5 years of experience as a Senior Frontend Developer.
• Hands-on experience with Web Components using Lit.
• Proficient in automated frontend tests like Jest and Cypress.

Responsabilidades

• Migrate legacy frontend code to modern architecture.
• Design high-performance, accessible components.
• Collaborate with backend teams to define APIs.

Conocimientos

Frontend development

Web Components

Microfrontend architecture

Automated testing

Performance optimization

Herramientas

AWS S3

Git

Vite

Webpack

Descripción del empleo

ActioGlobal is the agency that transforms leading organizations all over the world to shape the future of work. Since 2004, we partner with top leaders in their industries to disrupt organizational cultures and achieve high impact at accelerating speed, such as Pepsico, Unilever, Nestlé, Danone, Siemens, BASF, Adevinta, Canon, etc.

We Change How Work Is Done.

Our clients want a new way of working that delivers results. No excuses.

Through our platform they bridge the gap between strategy and execution.

Tasks

• Actively contribute to the migration of legacy frontend code to a modern architecture based on Web Components using Lit.
• Research and propose solutions for implementing Microfrontends, including evaluating suitable build tools for this architecture (migrating from Vite or others).
• Design and implement reusable, high-performance, accessible, and well-documented components.
• Optimize frontend performance (load times, rendering, asset optimization).
• Implement and maintain unit, integration, and end-to-end tests for the frontend.
• Collaborate with the backend team to define interface contracts (APIs).
• Participate in defining and refining technical specifications and UI / UX requirements.
• Manage frontend deployment, with familiarity with platforms such as AWS S3.
• Conduct critical and constructive code reviews to ensure quality and adherence to frontend architecture and best practices.
• Mentor other team members on modern frontend development, Web Components, and advanced architectural patterns.
• Identify and resolve complex technical issues and frontend bugs.
• Work closely with UX / UI designers and other stakeholders.
• Contribute to the continuous improvement of frontend development processes, tools, and team standards.

Requirements

You will rock at this role if you have :

• At least 5 years of proven experience as a Senior Frontend Developer.
• Solid, hands-on experience in designing and implementing Web Components, ideally using Lit.
• Experience working with and migrating legacy frontend code to modern architectures.
• Experience with modern build and bundling tools (e.g., Vite, Webpack, Rollup) and the ability to evaluate them.
• Proficiency with Git version control and workflow practices (preferably feature branching).
• Strong experience writing automated frontend tests (e.g., Jest, Testing Library, Cypress, Selenium, etc.).
• Relevant knowledge or experience in designing and implementing Microfrontend architectures.
• Experience with frontend deployment (e.g., AWS S3, CloudFront).
• Proven ability to identify, design, and solve complex frontend and performance issues.
• Experience conducting thorough code reviews and providing constructive technical feedback.
• Understanding of UX / UI principles and ability to collaborate closely with designers.
• Clear and effective communication skills, and the ability to work collaboratively in a remote environment.
• Fluent Spanish and English are mandatory : You will interact with native and bilingual executives in a professional environment.
• French and German will be highly valued.
• You are based in Spain or you will in a short time

Get some extra points

• Experience with other modern frameworks (React, Vue, Angular) to understand different paradigms.
• Knowledge of TypeScript.
• Experience with Storybook or other component documentation tools.
• Understanding of accessibility principles (WCAG).
• Experience in CI / CD environments.
• Contributions to open-source projects.

What can you expect?

• Direct impact on the strategic execution of industry-leading companies
• Access to C-suite executives of world-leading brands
• Opportunity to develop cutting-edge technology for strategy execution
• Competitive salary with growth potential in a boutique consultancy
• Chance to be part of an elite team : the AtioGlobal team

Together, lets shape the future of work

Seniority level

Seniority level

Not Applicable

Employment type

Employment type

Full-time

Job function

Job function

Engineering and Information Technology

Business Consulting and Services

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