Senior Frontend Engineer, Marketing Website

As a Senior Frontend Engineer on our Website team, you'll be a co-owner of the platform behind synthesia.io http://synthesia.io: the component library, content model and rendering stack that every page on our marketing site is built from. You'll shape direction and make key technical decisions with the team, likely with a focus area of your own but context across the whole system. This is a hands-on engineering role, and your primary output is high-quality component and schema code, plus the tooling that lets others build with it.

Millions of people visit synthesia.io http://synthesia.io every month, and it is one of the main ways we win new customers. That comes with real responsibility. The decisions you make are seen at scale, and we set the quality bar accordingly.

The defining challenge of this role is composability: a marketing site that marketers, and increasingly AI agents, can build pages with, without breaking design, performance or SEO.

• Build, scale and evolve our section library: the Astro components, Sanity schemas and design tokens that let us compose marketing pages consistently and accessibly.
• Own the content model. Design 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, 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: canonicals, sitemaps, structured data, redirects, and no traffic cliffs on launch.
• Raise the bar on engineering standards across the website surface: 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.

…