Top Front End Developer Jobs in London

Build and maintain scalable single-page web applications for CrowdStrike’s Falcon platform using React, Ember.js, JavaScript, HTML, and CSS. Develop automated tests, participate in code reviews, improve developer tooling, contribute to architecture and technical direction, and collaborate with security analysts, cloud engineers, designers, technical writers, and product managers. The role emphasizes accessible, high-quality interfaces, user-focused problem solving, and secure software supporting customers worldwide.

Build and evolve Synthesia’s marketing website platform, including Astro components, Sanity schemas, design tokens, rendering, SEO, localization, and AI-assisted development tooling. Own features end to end across frontend, server-side systems, APIs, databases, and deployment infrastructure. Translate Figma designs into responsive, accessible experiences, maintain performance and analytics standards, and guide technical direction, code quality, and adoption across website stakeholders.

Design, develop, test, and support high-performance frontend applications for global electronic trading and algorithmic trading platforms. Build real-time data visualizations for pricing, order books, and trade blotters using streaming data and modern UI frameworks. Provide technical oversight, optimize performance and latency, follow application lifecycle and governance standards, and collaborate with technology and product teams to deliver scalable solutions.

Design and develop high-performance frontend applications for global electronic trading and algorithmic trading platforms. Build real-time data visualizations, handle streaming market data, optimize low-latency UI performance, and support distributed applications. Provide technical oversight, follow application development and governance standards, and collaborate with technology and product teams to deliver compliant, scalable solutions.

Leads architecture and development of scalable, secure, accessible frontend and fullstack enterprise applications. Establishes UI engineering standards, reusable component libraries, design system adherence, automated testing, performance practices, and CI/CD governance. Designs API and backend integrations using REST, GraphQL, BFF layers, and microservices. Collaborates with product, UX, backend, infrastructure, and security teams; resolves complex technical problems; ensures cybersecurity and compliance; and mentors engineering teams.

Lead the architecture and development of scalable, secure, accessible frontend and fullstack web applications. Establish UI engineering standards, reusable component libraries, design system adherence, API and backend integrations, testing, performance, CI/CD, and security practices. Collaborate with product, UX, backend, infrastructure, and security teams to deliver complex technology initiatives. Provide technical leadership, mentor engineers, resolve complex system challenges, and ensure compliance with enterprise architecture and risk controls.

Build and scale resilient frontend web applications that present machine-learning insights, collaborate with cross-functional teams, develop reusable design systems and component libraries, maintain CI/CD and deployment workflows, champion frontend engineering standards, and mentor engineers. The role involves modern React and JavaScript or TypeScript development, data visualization, frontend architecture, cloud environments, and software delivery for government and other high-stakes clients.

Build and maintain production React screens for a browser-based transportation dispatch platform. Responsibilities include integrating APIs, managing Redux state, developing data-heavy and map-based interfaces, implementing accessibility and Playwright tests, optimizing performance, enhancing backend services, and shipping tested features weekly through collaborative pair-squad development.

Build and polish complex interactive video-editing features for Studio, including transitions, color grading, element libraries, presets, and customizable keyboard shortcuts. Own frontend-leaning full-stack work from proposal through launch, collaborate in a fast-moving startup environment, and contribute to product decisions and marketing efforts. Deep backend expertise is not required.

Build and maintain fast, intuitive frontend applications for blockchain and Web3 products. Collaborate with product, design, and engineering teams; develop reusable components and frontend architecture; integrate wallets and smart-contract interactions; improve performance, reliability, and accessibility; participate in technical planning and code reviews; mentor other developers and establish frontend best practices.

Build scalable, maintainable, and well-tested React applications that visualize AI and machine learning insights. Collaborate with data scientists, data engineers, and designers to deliver client-facing products. Lead frontend feature planning, deployment infrastructure, technical standards, reusable component libraries, mentoring, training, and onboarding while serving as the frontend engineering authority for the team.

Develop and maintain responsive, accessible, high-performance web applications using React and TypeScript. Build reusable components, integrate REST and GraphQL APIs, implement automated testing, optimize performance, and maintain code quality through reviews and static analysis. Use Azure DevOps for source control, work tracking, and automated deployments. Collaborate with product managers and backend engineers in an Agile sprint environment to deliver production-ready features from designs and requirements.

Build customer-facing web experiences, internal administrative tools, factory-floor operator interfaces, and AI-agent workflows. Own the design system across web applications and machine screens while balancing strong UI/UX design with end-to-end software development. The role requires shipping full-featured TypeScript and React applications, collaborating with users, deploying products, and using coding agents effectively. Bonus experience includes data visualization, functional languages, and industrial or operator interfaces.

Owns growth engineering initiatives across acquisition and conversion journeys, including landing pages, signup, checkout, subscriptions, and product launches. Builds fast, accessible front-end experiences using TypeScript, React, and Next.js, while contributing to Kotlin or Python backend services. Partners with marketing, CRM, product, design, and analytics teams; runs A/B tests; measures conversion outcomes; contributes to the design system; and ships continuously with monitoring and testing.

Lead frontend architecture and product delivery across Moxie, with a focus on design systems, GraphQL data architecture, frontend tooling, CI, performance, and development workflows. Partner with Design, Product, engineering managers, and staff engineers to establish canonical patterns, guide adoption without formal authority, ship FinOps features, and drive organization-wide technical initiatives. The role remains hands-on while influencing architecture, engineering culture, and AI-native software development practices.

Build and own customer-facing web and mobile features end to end, from user discovery and design through implementation, rollout, and adoption. Develop with TypeScript, React, and React Native; improve APIs, data models, testing, CI/CD, and frontend quality guardrails. Collaborate directly with care teams, prioritize privacy and safety for health data, and ship reliable products across multiple markets and languages.

Build and maintain high-traffic trading applications within the Vue ecosystem. Responsibilities include developing scalable front-end systems, TypeScript libraries, real-time browser connectivity, UI components, performance improvements, testing, and architecture enhancements. The role involves collaborating on large-scale projects, guiding front-end technology decisions, and contributing to a shared Vue component library. It requires strong SPA development experience, modern tooling knowledge, and familiarity with AI concepts and real-time data.

Develop and maintain C#/.NET applications and infrastructure for real-time data delivery across trading, risk, compliance, and operations. Build scalable data flows, optimize architecture and memory usage, investigate production performance issues, and improve system reliability. Contribute to React and TypeScript user interfaces while collaborating with technical and business stakeholders on trading and operational workflows.

Build and evolve scalable frontend products for Rightmove’s core search experience using React, TypeScript, Express, Node.js, Kubernetes, and GitLab. Deliver reliable software through continuous delivery, collaborate with Product, Design, Architects, and Engineering, influence technical direction, design resilient systems, contribute to engineering standards, mentor fellow engineers, and promote testing, automation, performance, and user experience excellence.

Develop and maintain Keet Desktop, a cross-platform peer-to-peer communications application built with React and the Pear runtime. Responsibilities include implementing UI/UX, optimizing performance, writing maintainable and tested code, debugging complex frontend applications, and contributing to decentralized communication technology. The role involves collaboration within a remote global team and may include desktop application, real-time communication, and open-source development.

Develop and maintain Keet Desktop, a cross-platform peer-to-peer communications application built with React and the Pear runtime. Responsibilities include implementing UI/UX, optimizing performance, writing maintainable and tested code, debugging complex frontend applications, and contributing to decentralized communication technologies in a globally distributed remote team.

Own the React and TypeScript web client for an enterprise AI agent product. Build streaming, trustworthy interfaces for generated content and actions, with explicit user consent and transparent agent behavior. Lead front-end architecture, component systems, accessibility, performance, security, testing, observability, and production delivery. Collaborate across service boundaries and help shape emerging protocols including MCP Apps, AG-UI, and A2UI, while advancing Lit and Web Components adoption.

Maintain and improve the company website by developing frontend features, implementing design enhancements, ensuring responsive and accessible experiences, optimizing performance and SEO, fixing bugs, and maintaining scalable code. The role collaborates with design, marketing, and backend teams while independently owning website reliability, speed, security, and user experience.

Build and own product features end to end across Next.js, React, TypeScript, and Laravel. Translate prototypes and specifications into production code, use and critically review AI-generated code, maintain tests, manage data and permissions safely, and ship changes to a live enterprise event-management platform. The role emphasizes front-end development, full-stack ownership, product thinking, accessibility, and collaboration with product teams.

Build and scale reliable, API-driven global payment systems integrating banks and payment gateways. Translate product and design requirements into maintainable, tested components; improve performance, accessibility, and usability; contribute to shared libraries and code reviews; and support feature operational health. Collaborate with product, business, operations, design, and backend teams while driving technical decisions, architectural improvements, and engineering practices for large-scale financial infrastructure.