Senior Front-End Developer

La Fosse; Greater London; Remote; GBP 64,000 - 84,000; Full time

Job summary

La Fosse is seeking a Senior Front-End Engineer to lead frontend architecture and deliver scalable web applications using React, Next.js and TypeScript. You’ll shape frontend standards, mentor peers and collaborate with product, design and backend teams.

You’ll work on high-profile projects for UK brands, exploring AI-enabled capabilities while maintaining performance, accessibility and security across platforms in a remote UK setting.

Qualifications

• 6+ years’ commercial frontend development experience with React and TypeScript.
• Strong Next.js experience, App Router, Server Components and modern rendering approaches.
• Experience as Senior Engineer or Technical Lead.
• Web performance, accessibility and SEO understanding.

Responsibilities

• Own frontend architecture across complex web applications.
• Develop modern, responsive apps with React, Next.js and TypeScript.
• Make architectural decisions on rendering, state, caching and performance.
• Build and maintain reusable UI components and design systems.

Skills

React

TypeScript

Next.js

App Router

Server Components

UI Architecture

Storybook

REST/GraphQL

Testing

AI tools

Tools

Storybook

Job description

Senior Front-End Engineer | React / Next.js / TypeScript | £400PD (Outside) | Remote

An exciting opportunity has opened up for an experienced Senior Frontend Engineer to join a growing digital engineering team, working on complex, high-profile projects for some of the UK's most recognisable brands.

We're looking for someone who is passionate about building exceptional web experiences, enjoys taking ownership of technical decisions and wants to play a key role in shaping how modern frontend applications are designed and delivered.

This is a hands-on position with plenty of technical influence, combining modern frontend development, architecture, mentoring and exposure to emerging AI technologies.

The Role

You'll be responsible for designing and delivering scalable, high-performing web applications, working closely with product, design and engineering teams to bring ambitious digital experiences to life.

Your responsibilities will include:

• Taking ownership of frontend architecture across complex web applications.
• Developing modern, responsive applications using React, Next.js and TypeScript.
• Making architectural decisions around rendering strategies, state management, caching and application performance.
• Building and maintaining reusable UI components and design systems.
• Integrating frontend applications with headless CMS platforms, APIs and backend services.
• Championing engineering best practices across accessibility, performance, security and automated testing.
• Collaborating with designers to transform concepts and prototypes into polished, production-ready interfaces.
• Exploring opportunities to integrate AI-powered functionality into customer-facing applications.
• Supporting and mentoring other engineers through code reviews, technical guidance and knowledge sharing.
• Working directly with stakeholders to shape technical solutions and influence project delivery.

What We're Looking For:

• 6+ years’ commercial frontend development experience, with deep expertise in React and TypeScript.
• Strong production experience with Next.js, including App Router, Server Components and modern rendering approaches.
• Previous experience operating as a Senior Engineer or Technical Lead.
• Strong understanding of web performance optimisation, accessibility and SEO.
• Experience developing component libraries or design systems using tools such as Storybook.
• Experience integrating REST/GraphQL APIs and headless CMS platforms.
• Familiarity with modern testing frameworks such as Jest, Vitest, Playwright or Cypress.
• Hands-on experience using AI development tools such as Claude Code, Cursor or GitHub Copilot.
• Strong communication skills and the ability to guide technical decisions across engineering teams.
• Exposure to headless CMS platforms such as Contentful, Storyblok or Optimizely.
• Experience building ecommerce platforms or high-traffic consumer applications.
• An interest in AI-powered applications, LLM integrations or conversational interfaces.
• Experience with cloud hosting, CI/CD pipelines and modern deployment platforms.
• Previous experience delivering projects in a consultancy, agency or client-facing environment.

What's on Offer?

This is an opportunity to join an established but evolving engineering environment, where you'll have genuine ownership over technical decisions and the chance to influence frontend standards across multiple projects.

You’ll work with modern technologies, collaborate with talented engineers and designers, and gain exposure to innovative projects incorporating AI and emerging digital capabilities.

If you're a strong React/Next.js engineer looking for a role that combines hands-on development with technical leadership, we'd be keen to hear from you.