Senior Frontend Engineer, Marketing Website

Job summary

Responsibilities

As a Senior Frontend Engineer on our Website team, you'll be a co-owner of the platform behind synthesia.io: the component library, content model and rendering stack that every page on our marketing site is built from.

• 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.

What they're looking for

• 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. You've designed schemas other people had to live with, and you have opinions about references vs.
• Deep front-end expertise: expert HTML, CSS and TypeScript, with a strong command of component API design and the developer experience of a shared library.
• You can work end to end. Comfortable owning the server side as well as the front end: SSR, serverless and edge runtimes, API routes, a SQL database, secrets and CI.
• Solid understanding of responsive design, cross-browser compatibility and web performance, and comfortable building to WCAG 2.2 AA.

Tech stack

• Figma
• TypeScript
• SQL
• AWS