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

Actio Global; Málaga; A distancia; EUR 45.000 - 60.000; Jornada completa

Descripción de la vacante

A leading consulting agency in Andalucía is seeking a Senior Frontend Developer to modernize their frontend architecture. This role involves migrating legacy code, designing performance-optimized components, and conducting code reviews. Candidates should have deep expertise in modern JavaScript, Web Components, and performance tuning, along with strong English and Spanish communication skills. A unique opportunity to influence industry-leading organizations while working with cutting-edge technologies.

Servicios

Direct impact on strategic execution

Access to C-suite executives

Competitive salary with growth potential

Be part of an elite team

Formación

• At least 5 years of proven experience as a Senior Frontend Developer.
• Fluent Spanish and English are mandatory.
• Strong experience writing automated frontend tests.

Responsabilidades

• Contribute to the migration of legacy frontend code.
• Design and implement reusable, high-performance components.
• Conduct code reviews and mentor team members.

Conocimientos

Modern JavaScript (ESNext)

Web Components

Frontend performance optimization

Automated frontend tests

Git version control

Microfrontend architecture

Accessibility principles (WCAG)

Effective communication in English and Spanish

Herramientas

Lit

AWS S3

Vite

Jest

Cypress

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 don't consult.

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.

As a Senior Frontend Developer , you will play a key role in the ongoing evolution and modernization of our frontend. Your deep expertise in modern JavaScript, Web Components with Lit, and advanced frontend architectures will be essential for migrating existing functionality, ensuring exceptional performance and quality, and helping define our future microfrontend strategy. You will also be instrumental in evaluating future technical directions and mentoring the team through code reviews and guidance.

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.
• Write clean, well-structured modern JavaScript (ESNext) following best practices.
• Optimize frontend performance (load times, rendering, asset optimization).
• Ensure cross-browser compatibility and responsive behavior.
• 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.

Deep expertise in modern JavaScript (ESNext).

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.

Prior formal experience mentoring developers.

Contributions to open-source projects.

Benefits

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

Industries Business Consulting and Services

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