S
Senior Frontend Engineer, Marketing Website
Contract type
Ongoing
Work mode
Hybrid · London, United Kingdom
Experience
Senior · 5+ years
Job description
Senior Frontend Engineer on Synthesia's Website team, co-owning the platform behind synthesia.io: the component library, content model and rendering stack used to build marketing pages. A hands-on engineering role focused on composability, quality and scale.
At a glance
- Employment
- Full-time · Employee (employment agreement)
- Work mode
- Hybrid · London, United Kingdom
- Languages
- English
What you'll do
- Build, scale and evolve the section library: Astro components, Sanity schemas and design tokens for composing marketing pages consistently and accessibly
- Own the content model; design schemas that resist misuse so editors or agents can build pages correct by construction
- Take Figma component specs to production: responsive across mobile, tablet and desktop, accessible by default, matching design intent
- Extend the platform for AI-assisted development so coding agents can generate on-brand, on-spec sections from a design spec
- Own SEO integrity: canonicals, sitemaps, structured data, redirects, and no traffic cliffs on launch
- Raise engineering standards across the website surface: thorough code review, patterns others can follow, and tests around the parts that break
- Maintain and extend localisation across nine locales and a translation pipeline
- Shape the technical direction of the website platform over the next 6 to 12 months and champion its adoption
What we're looking for
- At least 5 years as a software engineer, including 3 at senior level, building front end for content-driven or marketing platforms
- Real ownership of a content model in Sanity; designed schemas others had to live with, with opinions on references vs. embedded objects, schema vs. runtime variants, and preventing section library sprawl; familiar with GROQ and Portable Text
- Deep front-end expertise: expert HTML, CSS and TypeScript, strong command of component API design and developer experience of a shared library
- Ability to work end to end, owning the server side as well as the front end: SSR, serverless and edge runtimes, API routes, a SQL database, secrets and CI; able to take a feature from schema to component to route and debug production-only issues
- Solid understanding of responsive design, cross-browser compatibility and web performance, comfortable building to WCAG 2.2 AA
- Care that marketing sites are measured on performance, SEO, analytics events and conversion, and accountability to those numbers
- Strong sense of craft and attention to detail, with judgement to balance design intent against engineering constraints
- Strong communication and collaboration skills; explains reasoning, reviews generously, and treats levelling up others as part of the job
Nice to have
- Prior experience working on a large SaaS marketing website at real traffic and with real stakes
- 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
- Strong design sensibility: an eye for visual detail and judgement to push back on and improve design decisions
- Experience with localisation and internationalisation at scale for a global audience
- Analytics and tag management implementation: dataLayer events, server-side tagging, getting attribution right without hurting performance
Your team
Website team
Owns the platform behind synthesia.io: the component library, content model and rendering stack that every page on the marketing site is built from.
Apply
Direct apply at Synthesia
Opens the job posting at Synthesia
About Synthesia
The world's leading AI video platform for business
Synthesia develops products to enhance visual communication and enterprise skill development, helping people work better and stay at the center of successful organizations. Founded in 2017 and headquartered in London, with offices and teams across Europe and the US.
Key facts
- 2017
- London
- AI video platform
- Used by over 90% of the Fortune 100
- Raised $200 million in a recent Series E round
- Total funding exceeds $530 million
- Offices and teams across Europe and the US
Partners & customers
AccelNVentures (Nvidia's VC arm)Kleiner PerkinsGVEvantic Capital