Type
Remote
Location
Remote - UK/Europe
Experience
Senior (5+ yrs)
Posted
Today
Tech Stack
Quick Take
Senior frontend design-system role at Synthesia, the London-based AI video platform. Fully remote across the UK and Europe. You co-own the React and TypeScript component library, with accessibility to WCAG 2.2 AA and AI-agent consumability as first-class requirements. Apply directly through the Ashby listing.
Role Overview
🏢 About Synthesia
Synthesia builds an AI video platform that turns plain text into presenter-led videos for business training and communication. More than 50,000 customers, including most of the Fortune 100, use the platform. The company is headquartered in London with teams across Europe and the US.
🎯 The Role
Synthesia is looking for a Senior Frontend Engineer to co-own the design system every product team builds on. This is a hands-on engineering role: the primary output is high-quality component code and the tooling around it. The defining challenge is making the foundation AI-friendly — a design system that both people and AI agents can build with, staying on-brand, accessible, and correct by construction.
🛠️ Tech Stack
- React + TypeScript
- HTML5, CSS3, JavaScript
- Storybook
- Design tokens and component APIs
- Accessibility tooling (WCAG 2.2 AA / EN 301 549)
💼 What You'll Do
- Build, scale, and evolve the component library, design tokens, and documentation
- Extend the system for AI-assisted development, with Storybook as the backbone and machine-readable interfaces (e.g. MCP) layered on top
- Design component APIs that resist misuse, for AI and human developers alike
- Make components accessible by default and verify them with keyboard and screen reader
- Own the developer experience: clear docs, versioning, and migration paths
- Implement theming, white labelling, and localization/RTL support
✅ What You'll Need
- At least five years as a software engineer, including three at senior level, building frontend platforms
- Expert HTML, CSS, and JavaScript/TypeScript with strong React
- Component API design, versioning, and the developer experience of shared libraries
- Solid responsive design, cross-browser compatibility, and web performance
- Accessibility as part of your definition of done (WCAG 2.2 AA / EN 301 549)
- Strong craft, attention to detail, and clear communication
🌟 Nice to Have
- A strong design sensibility
- Experience implementing multi-brand theming in production
- Localization and internationalization, including RTL
Why This Role?
This is a curated frontend role from Synthesia. Every listing on OnlyFrontendJobs is hand-picked for frontend relevance and quality. The tech stack leans on React, TypeScript, JavaScript. Tagged 💰 High Comp for above-market pay.
Senior Frontend Engineer, Design System at Synthesia — FAQ
Quick answers about this role, the stack, and how to apply.