Senior Frontend Engineer, Marketing Website (Hybrid/Remote)

MMC; Greater London; Hybrid; GBP 90,000 - 140,000; Full time

Job summary

Synthesia, the world’s leading AI video platform, seeks a Senior Frontend Engineer for the Website team. You’ll co-own the marketing site platform, including the component library, content model, and rendering stack.

You’ll work across the full stack with a focus on reliability, accessibility, and performance. You’ll own schemas, develop production-ready components from design specs, and extend the system for AI-assisted development.

Qualifications

• 5+ years as a software engineer, with senior experience on frontend for content-driven or marketing platforms.
• Deep ownership of a content model in Sanity, with schema design experience.
• Strong HTML, CSS, and TypeScript expertise; high-quality component API design.
• Ability to own end-to-end work: server-side, SSR, API routes, and CI.
• Commitment to responsive design, cross-browser compatibility and WCAG 2.2 AA.
• Focus on marketing site metrics: performance, SEO, analytics, and conversions.
• Experience with building a shared library and DX in a design-system context.

Responsibilities

• Build, scale and evolve the section library and design tokens for marketing pages.
• Own the content model; design resilient schemas for editor and AI agents.
• Implement components end-to-end from Figma specs to production across responsive breakpoints.
• Extend platform for AI-assisted development to generate on-brand sections from designs.
• Maintain SEO integrity: canonicals, sitemaps, structured data, redirects.
• Raise engineering standards with thorough reviews, patterns and test coverage.
• Ensure localization across nine locales and maintain translation pipeline.
• Shape the website platform direction for the next 6–12 months and drive adoption.

Skills

Frontend engineering

TypeScript

HTML/CSS

Accessibility (WCAG 2.2 AA)

Web performance optimization

Cross-functional collaboration

Tools

Sanity CMS

GROQ

Portable Text

Astro

Cloudflare Workers

AWS Lambda

Tailwind CSS

Job description

Synthesia, the world’s leading AI video platform, seeks a Senior Frontend Engineer for the Website team. You’ll co-own the marketing site platform, including the component library, content model, and rendering stack.

You’ll work across the full stack with a focus on reliability, accessibility, and performance. You’ll own schemas, develop production-ready components from design specs, and extend the system for AI-assisted development.