Senior Frontend Engineer, Marketing Website

The role

You will co-own the platform behind synthesia.io, including the component library, content model, and rendering stack. You will build and scale the section library, own the content model, and ensure SEO integrity and accessibility.

What you will do

• Build, scale and evolve the section library using Astro components, Sanity schemas and design tokens.
• Own the content model and design schemas.
• Take Figma component specs to production across mobile, tablet and desktop.
• Extend the platform for AI-assisted development.
• Own SEO integrity including canonicals, sitemaps, structured data, and redirects.
• Raise engineering standards through code review, patterns and tests.
• Maintain and extend localisation across nine locales and a translation pipeline.
• Shape the technical direction of the website platform.

Required qualifications

• At least five (5+) years as a software engineer, including three (3) at senior level, building front end for content-driven or marketing platforms.
• Real ownership of a content model in Sanity.
• Expert HTML, CSS and TypeScript.
• Strong command of component API design and the developer experience of a shared library.
• Comfortable owning the server side including SSR, serverless and edge runtimes, API routes, a SQL database, secrets and CI.
• Solid understanding of responsive design, cross-browser compatibility and web performance.
• Comfortable building to WCAG 2.2 AA.
• Strong communication and collaboration skills.

Nice to have

• Prior experience working on a large SaaS marketing website
• Astro, or another islands or static-site framework
• Cloudflare Workers, or another edge or serverless platform
• Experience with AWS Lambda
• Tailwind CSS v4, and experience working from a token-based design system
• Experience, or strong interest, in making component libraries and content models consumable by AI agents
• A strong design sensibility
• Experience with localisation and internationalisation at scale for a global audience
• Analytics and tag management implementation

Before you apply

• Remote workers in Europe are subject to compliance and right to work checks

About the company

Synthesia is the world’s leading AI video platform for business. The company is headquartered in London, with offices and teams across Europe and the US.