frontend developer for marketing websites

Synthesia develops an AI video platform for business that supports visual communication and enterprise skill development. The platform is used by over 90% of Fortune 100 companies.

• Build, scale, and evolve the section library using Astro components, Sanity schemas, and design tokens;
• Own the content model and design schemas that enable editors and AI agents to build correct pages;
• Take Figma component specifications through to production across mobile, tablet, and desktop;
• Extend the platform for AI-assisted development;
• Own SEO integrity, including canonicals, sitemaps, structured data, redirects, and launch stability;
• Raise engineering standards through code reviews, reusable patterns, and targeted tests;
• Maintain and extend localisation across nine locales and the translation pipeline;
• Shape the technical direction of the website platform over the next 6 to 12 months and champion its adoption.

• At least five years of software engineering experience, including three years at senior level, building front end for content-driven or marketing platforms;
• Real ownership of a Sanity content model, including schema design, references, embedded objects, runtime variants, GROQ, and Portable Text;
• Expert knowledge of HTML, CSS, and TypeScript;
• Strong command of component API design and shared-library developer experience;
• Ability to work end to end across SSR, serverless and edge runtimes, API routes, SQL databases, secrets, and CI;
• Ability to take features from schema to component to serving route without handoff;
• Understanding of responsive design, cross-browser compatibility, and web performance;
• Experience building to WCAG 2.2 AA;
• Accountability for performance, SEO, analytics events, and conversion metrics;
• Strong attention to detail and judgement in balancing design intent with engineering constraints;
• Strong communication and collaboration skills, including generous code reviews and mentoring colleagues;
• Nice to have: experience with a large SaaS marketing website, Astro or another islands or static-site framework, Cloudflare Workers or another edge or serverless platform, AWS Lambda, Tailwind CSS v4, token-based design systems, component libraries and content models consumable by AI agents, strong design sensibility, localisation and internationalisation at scale, analytics and tag management implementation.

• Remote workers elsewhere in Europe can be accommodated subject to compliance and right to work checks;
• No contractors possible;
• A 75-minute practical exercise is part of the hiring process.