Senior Frontend Engineer

November 7, 2026

Hybrid

Senior

London, United Kingdom

Indeed

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Mandatory office attendance

Description

A Senior Frontend Engineer role on the website team, co-owning the platform behind the marketing site: the component library, content model and rendering stack built from Astro components, Sanity schemas and design tokens. The engineer shapes technical direction, owns the content model and SEO integrity, and takes Figma specs all the way to production. The defining challenge is composability — letting marketers and AI agents build pages without breaking design, performance or SEO. Millions of monthly visitors make quality, accessibility and measurement first-class concerns.

Responsibilities

Make key technical decisions as co-owner of the website platform, with a focus area of your own but context across the whole system
Build, scale and evolve the section library: Astro components, Sanity schemas and design tokens for consistent, accessible marketing pages
Own the content model, designing schemas that resist misuse so pages are 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
Extend the platform for AI-assisted development so coding agents can generate on-brand, on-spec sections from a design spec
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 with 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 for a global audience
Shape the technical direction of the website platform over the next 6 to 12 months and champion its adoption

Requirements

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, with opinions on references vs embedded objects and how to stop a section library sprawling
GROQ and Portable Text are familiar territory
Deep front-end expertise: expert HTML, CSS and TypeScript
Strong command of component API design and the developer experience of a shared library
End-to-end capability: SSR, serverless and edge runtimes, API routes, a SQL database, secrets and CI
Solid understanding of responsive design, cross-browser compatibility and web performance
Comfortable building to WCAG 2.2 AA — accessibility is part of the definition of done
Marketing sites are measured on performance, SEO, analytics events and conversion, and you are accountable to those numbers
Strong sense of craft and attention to detail, balancing design intent against engineering constraints
Strong communication and collaboration skills, explaining reasoning and reviewing generously
Prior experience on a large SaaS marketing website with real traffic and real stakes
Astro or another islands or static-site framework
Cloudflare Workers or another edge or serverless platform, and 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 with the judgement to push back on and improve design decisions, not just build them
Experience with localisation and internationalisation at scale for a global audience
Analytics and tag management implementation: dataLayer events, server-side tagging, attribution without hurting performance

Conditions

Full-time employment in a hybrid work format
Preference for this role to be based hybrid out of the London, UK office
Remote workers elsewhere in Europe can be accommodated subject to compliance and right to work checks