frontend js/react/typescript for AI video platforms

Synthesia develops an AI video platform for businesses, helping organizations enhance visual communication and enterprise skill development. Its products are used by over 90% of the Fortune 100, and its proprietary generative AI technology is built in-house.

• Build, scale and evolve the design system, including the component library, design tokens and documentation;
• Extend the design system for AI-assisted development using Storybook and machine-readable interfaces such as MCP;
• Design component APIs that resist misuse by AI and human developers;
• Write high-quality, performant frontend code with React and TypeScript;
• Partner with design, product and engineering to define components and deliver production-ready solutions;
• Make components accessible by default according to WCAG 2.2 AA;
• Own the developer experience of the design system, including documentation, guidelines, Storybook, component APIs, versioning and migration paths;
• Implement and maintain theming, white labelling and localization/RTL support;
• 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 and champion adoption across teams.

• At least five years of experience as a software engineer, including three years at senior level, building frontend platforms;
• Real ownership of a design system or shared component library used across multiple products;
• Expert knowledge of HTML, CSS and JavaScript/TypeScript;
• Strong React experience and familiarity with modern build tooling;
• 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;
• Experience building components to WCAG 2.2 AA / EN 301 549 and verifying accessibility with a keyboard and screen reader;
• Strong sense of craft and attention to detail;
• Ability to balance design intent with engineering constraints;
• Strong communication and collaboration skills;
• Nice to have: strong design sensibility, experience implementing multi-brand theming in production, experience with localization and internationalization including RTL.

• Relocation support is available;
• Remote work is available in London, UK and other locations across Europe, subject to compliance and right to work checks;
• EUR/GBP/CHF 120,000 base salary plus stock option plan;
• This is full-time employment only, usually through OysterHR; contractors are not possible;
• 25 Days of leave plus local holidays;
• No extra paid or unpaid leave is possible;
• Visa sponsorship is available only for candidates already in the UK or an EU country who need support.