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Synthesia

Senior Frontend Engineer – Design System

Synthesia

Senior Software Engineer on a Design System team at Synthesia. Building components and tooling for AI-assisted development in modern web applications.

Posted 7/6/2026full-timeRemote • 🇬🇧 United KingdomSenior💰 €120,000 per yearWebsite

Core Competencies

Role fit
Core Competencies

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Demonstrates expertise in building and evolving design systems, focusing on component libraries, accessibility, and developer experience. Proficient in frontend technologies such as React and TypeScript, with a strong emphasis on component API design and performance optimization.

Highest-signal resume keywords
React DevelopmentTypeScript ProficiencyComponent API DesignWCAG 2.2 AccessibilityDesign System Ownership

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills
HTMLCSSJavaScriptResponsive DesignCross-Browser CompatibilityWeb PerformanceVersioningThemingLocalizationMachine-Readable Interfaces
Soft Skills
Strong CommunicationCollaborationAttention to DetailPassion for Developer ProductivityImproving End-User Experience
Tools & Technologies
StorybookModern Build ToolingScreen ReaderKeyboard Navigation
Industry Keywords
Design TokensComponent LibraryAI-Assisted DevelopmentAccessibility Best PracticesDeveloper Experience

Tech Stack

Tools & technologies
JavaScriptReactTypeScript

About the role

Key responsibilities & impact
  • Build, scale and evolve our design system: the component library, design tokens, and documentation that give product teams a consistent, accessible foundation to build on.
  • Extend our design system for AI-assisted development so AI coding tools and agents can use our components, tokens and guidelines as easily as people can, with Storybook as the backbone and machine-readable interfaces (e.g. MCP) layered on top.
  • Design component APIs that resist misuse, so AI and human developers alike can build with confidence.
  • Write high-quality, performant frontend code (React/TypeScript) and raise the bar for component craft and consistency across the engineering org.
  • Partner closely with design, product and engineering to define components together and take them all the way to something that holds up in production.
  • Make our components accessible by default, meeting WCAG 2.2 AA, and work closely with our Accessibility engineer to bake in best practices from the start.
  • Own the developer experience of the design system: clear documentation, guidelines, Storybook, sensible component APIs, versioning and smooth migration paths that make adoption easy for both human and AI consumers.
  • Implement and maintain theming, white labelling, and localization/RTL support so the system works for a global audience.
  • Continuously improve the system based on adoption metrics, contributor feedback and new platform capabilities.
  • Shape the technical direction of the design system over the next 6–12 months, championing its adoption across teams.

Requirements

What you’ll need
  • At least five (5) years as a software engineer, including three (3) at senior level, building frontend platforms, with real ownership of a design system or shared component library used across multiple products.
  • Deep frontend expertise: expert HTML, CSS and JavaScript/TypeScript, with strong React and familiarity with modern build tooling.
  • A strong command of component API design, versioning and the developer experience of shared libraries.
  • Experience (or strong interest) in making component libraries consumable by AI
  • Solid understanding of responsive design, cross-browser compatibility and web performance.
  • Comfortable building components to WCAG 2.2 AA / EN 301 549 and verifying them yourself with a keyboard and screen reader — accessibility is part of your definition of done, not a separate pass.
  • A strong sense of craft and attention to detail, and the ability to balance design intent with engineering constraints.
  • Strong communication and collaboration skills, and a passion for improving developer productivity and end-user experience.

Benefits

Comp & perks
  • 25 days of leave + local holidays
  • Stock option plan
  • Professional development opportunities