Senior Frontend Engineer, Design System

This position is listed on behalf of a partner company, who manages all applications and next steps. Our partner is looking for a Senior Frontend Engineer, Design System based in Spain.

This is a senior engineering opportunity focused on building the shared UI foundation that powers multiple products and teams. You will own and evolve a modern design system spanning component libraries, design tokens, documentation, and developer tooling. A key focus will be making the system AI-friendly so both developers and AI agents can create consistent, accessible interfaces by default. You will work hands-on with React and TypeScript while shaping component APIs, performance, accessibility, theming, and localization. The role combines deep frontend engineering with close collaboration across design, product, accessibility, and engineering teams. You will influence technical direction, improve developer experience, and drive adoption of the design system across the organization. This is an opportunity to shape a foundational platform at the intersection of frontend engineering, design systems, and AI-assisted development.

Accountabilities: Build, scale, and continuously evolve the design system, including its component library, design tokens, documentation, and supporting tooling.

Develop the system for AI-assisted development, enabling coding tools and AI agents to consume components, tokens, guidelines, and machine-readable interfaces effectively.

Design robust component APIs that minimize misuse and make correct implementation intuitive for both human and AI developers.

Write high-quality, performant frontend code using React and TypeScript while establishing strong standards for component quality and consistency.

Partner with designers, product managers, and engineers to define components and take them from concept through production-ready implementation.

Build accessible components aligned with WCAG 2.2 AA and incorporate accessibility best practices throughout the development lifecycle.

Own the developer experience, including Storybook, documentation, guidelines, versioning, component APIs, and smooth migration paths.

Implement and maintain theming, white-label capabilities, localization, and right-to-left support for a global user base.

Monitor adoption, contributor feedback, and evolving platform capabilities to identify opportunities for continuous improvement.

Help establish the technical roadmap and direction of the design system over the next 6–12 months.

Champion adoption of shared components and best practices across engineering teams.

Contribute to a culture of strong frontend engineering, thoughtful design, accessibility, and improved developer productivity.

Requirements

At least 5 years of software engineering experience, including 3 or more years at senior level, with experience building frontend platforms or shared UI systems.

Demonstrated ownership of a design system or component library used across multiple products or engineering teams.

Expert knowledge of HTML, CSS, JavaScript, and TypeScript, with strong hands-on React experience and familiarity with modern frontend build tooling.

Strong understanding of component API design, shared-library versioning, and developer experience.

Experience with, or strong interest in, making component libraries consumable and usable by AI-powered development tools and agents.

Solid knowledge of responsive design, browser compatibility, frontend architecture, and web performance.

Practical experience building and validating accessible interfaces against WCAG 2.2 AA and EN 301 549 standards.

Ability to independently validate accessibility using keyboard navigation and screen readers.

Strong attention to visual and technical detail, with the judgment to balance design intent, usability, maintainability, and engineering constraints.

Excellent communication and collaboration skills, with an ability to work effectively across engineering, product, design, and accessibility teams.

Strong sense of ownership and a passion for improving both developer productivity and end-user experience.

Strong design sensibility and the confidence to challenge and improve design decisions are highly valued.

Experience with production-grade multi-brand theming, localization, internationalization, or RTL support is a plus.

Ability to work remotely within Europe and meet applicable right-to-work and compliance requirements.

Benefits

Competitive base salary starting at €120,000 / £120,000 / CHF 120,000, depending on location and currency.

Stock option plan providing an opportunity to participate in the organization's long-term growth.

Full-time employment with no contractor arrangement.

25 days of annual leave plus local public holidays.

Remote-first working environment with the option to work from an office where available.

Opportunity to work on advanced AI products and contribute to the future of AI-assisted software development.

Collaborative environment with strong emphasis on engineering quality, autonomy, ownership, and continuous learning.

Opportunity to work alongside experienced engineering, design, product, and AI professionals.

Visa sponsorship may be available for eligible candidates already located within the UK or EU, subject to applicable requirements.

International working environment with opportunities to collaborate across European and US-based teams.

How Jobgether works: We use an AI-powered matching process to ensure your application is reviewed quickly, objectively, and fairly against the role's core requirements. Our system identifies the top-fitting candidates, and this shortlist is then shared directly with the hiring company. The final decision and next steps (interviews, assessments) are managed by their internal team. We appreciate your interest and wish you the best!  Why Apply Through Jobgether?    Data Privacy Notice: By submitting your application, you acknowledge that Jobgether will process your personal data to evaluate your candidacy and share relevant information with the hiring employer. This processing is based on legitimate interest and pre-contractual measures under applicable data protection laws (including GDPR). You may exercise your rights (access, rectification, erasure, objection) at any time.     #LI-CL1