Senior Frontend Engineer - Marketing Website Platform

synthesia; Greater London; Hybrid; GBP 110,000 - 150,000; Full time

Job summary

Synthesia is seeking a Senior Frontend Engineer for the Website team to own the marketing site platform, component library, and content model. You’ll shape direction, make key technical decisions, and deliver high-quality TS/HTML/CSS across pages.

You'll work end-to-end from schema to route, ensure accessibility (WCAG 2.2 AA), SEO integrity, and performance, and extend localization across nine locales while guiding others through design and engineering trade-offs.

Qualifications

• Five+ years as a software engineer with three+ years in senior frontend roles.
• Ownership of a content model in Sanity and schema design decisions.
• Strong HTML/CSS/TypeScript, and experience with a shared component library.
• Experience end-to-end from schema to route, including SSR/serverless.
• Proven accessibility work to WCAG 2.2 AA and responsive design.
• Focus on marketing sites with performance, SEO, and analytics in mind.
• Ability to collaborate and mentor teammates, balancing design and engineering.

Responsibilities

• Build, scale and evolve the section library, component schemas, and design tokens.
• Own the content model and design schemas to prevent misuse.
• Translate Figma specs to production with responsive, accessible components.
• Extend platform for AI-assisted development with reliable sections.
• Maintain SEO integrity: canonicals, sitemaps, redirects, data quality.
• Raise engineering standards with thorough reviews and robust tests.
• Maintain localisation across nine locales and a translation pipeline.
• Shape technical direction of the website platform over 6–12 months.

Skills

HTML/CSS

TypeScript

Component API design

Sanity content model

GROQ & Portable Text

SSR / edge runtimes

WCAG accessibility

SEO & analytics

Localization

Tools

Sanity

Astro

Cloudflare Workers

AWS Lambda

Tailwind CSS

Job description

Synthesia is seeking a Senior Frontend Engineer for the Website team to own the marketing site platform, component library, and content model. You’ll shape direction, make key technical decisions, and deliver high-quality TS/HTML/CSS across pages.

You'll work end-to-end from schema to route, ensure accessibility (WCAG 2.2 AA), SEO integrity, and performance, and extend localization across nine locales while guiding others through design and engineering trade-offs.