Senior Frontend Engineer, Marketing Website

• Co-own the platform behind synthesia.io: the component library, content model, and rendering stack that every page on the marketing site is built from. • Shape direction and make key technical decisions with the team, likely with a focus area of your own but context across the whole system. • Work hands-on, producing high-quality component and schema code plus the tooling that lets others build with it. • Take real responsibility for a site millions of people visit every month, one of the main ways Synthesia wins new customers. • Tackle the defining challenge of the role: composability, so marketers and increasingly AI agents can build pages without breaking design, performance, or SEO. • Be based in the London office or work remotely from London, with other European locations possible subject to compliance and right to work checks.

• Have at least five years as a software engineer, including three at senior level, building front end for content-driven or marketing platforms. • Have really owned a content model in Sanity, designing schemas other people had to live with, with opinions on references versus embedded objects, when a variant belongs in the schema versus at runtime, and how to stop a section library sprawling. • Know GROQ and Portable Text as familiar territory. • Bring deep front-end expertise: expert HTML, CSS, and TypeScript, with strong command of component API design and the developer experience of a shared library. • Work end to end, owning the server side as well as the front end across SSR, serverless and edge runtimes, API routes, a SQL database, secrets, and CI, taking a feature from schema to component to route without handing off. • Debug happily in production, including issues that only reproduce there. • Understand responsive design, cross-browser compatibility, and web performance solidly, building to WCAG 2.2 AA with accessibility as part of your definition of done. • Care that marketing sites are measured on performance, SEO, analytics events, and conversion, and be happy to be accountable to those numbers. • Bring a strong sense of craft and attention to detail, with the judgement to balance design intent against engineering constraints. • Communicate and collaborate strongly, explaining your reasoning, reviewing generously, and treating levelling up the people around you as part of the job.

• Have worked on a large SaaS marketing website at real traffic with real stakes attached. • Have used Astro, or another islands or static-site framework. • Have used Cloudflare Workers, or another edge or serverless platform. • Have experience with AWS Lambda. • Have used Tailwind CSS v4 and worked from a token-based design system. • Have experience or strong interest in making component libraries and content models consumable by AI agents. • Bring a strong design sensibility, with an eye for visual detail and the judgement to push back on and improve design decisions rather than just build them. • Have handled localisation and internationalisation at scale for a global audience. • Have implemented analytics and tag management, covering dataLayer events, server-side tagging, and getting attribution right without hurting performance.

• Build, scale, and evolve the section library of Astro components, Sanity schemas, and design tokens that compose marketing pages consistently and accessibly. • Own the content model, designing schemas that resist misuse so an editor or an agent can build a page that is correct by construction rather than correct by review. • Take Figma component specs all the way to production: responsive across mobile, tablet, and desktop, accessible by default, and matching design intent precisely. • Extend the platform for AI-assisted development so coding agents can generate on-brand, on-spec sections from a design spec as reliably as a person can. • Own SEO integrity as a first-class engineering concern, covering canonicals, sitemaps, structured data, redirects, and avoiding traffic cliffs on launch. • Raise engineering standards across the website surface through thorough code review, patterns others can follow, and tests around the parts that actually break. • Maintain and extend localisation across nine locales and a translation pipeline so the system works for a global audience. • Shape the technical direction of the website platform over the next 6 to 12 months and champion its adoption with the people who publish on it.

• Own a platform seen by millions of visitors a month, where decisions are visible at scale. • Work on the composability problem of building a marketing site that both people and AI agents can publish to safely. • Join a culture focused on building rather than talking, planning, or politicising, where people are hired to do their best work without distractions. • Go through a practical, collaborative hiring process built around a real Figma section spec rather than Leetcode. • Join a fast-growing Series E company valued at $4 billion.

Synthesia is the world's leading AI video platform for business, used by over 90% of the Fortune 100. Founded in 2017 and headquartered in London, the company has offices and teams across Europe and the US, building products that enhance visual communication and enterprise skill development. Following a $200 million Series E round it is valued at $4 billion, with total funding exceeding $530 million from investors including Accel, NVentures, Kleiner Perkins, GV, and Evantic Capital.