Top Front End Developer Jobs in Belfast

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.

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 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.

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, maintain, and own features across React web and React Native mobile applications. Develop reusable components, responsive interfaces, and shared code; deliver complex features with product and design teams; support app releases; write tested, secure, scalable code; use AI development tools; and maintain production system health.

Build and maintain frontend software components using React, TypeScript, and WebGL. Responsibilities include API schema design, architectural and technology decisions, cross-team integration, code and design reviews, and improving system efficiency, scalability, and stability. The role also involves frontend testing, maintenance, and CI/CD within a hybrid Belfast-based team.

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 and optimize ZOE’s customer-facing website using TypeScript, React, and Next.js, with a strong focus on accessibility, performance, responsive design, and design-system development. Collaborate with designers, analysts, and product teams on user experiences and A/B testing. Contribute to backend services using Kotlin or Python, support API development, write maintainable code, and ship production improvements regularly.

Build and maintain production-grade React and TypeScript applications for financial workflows on the Canton Network. Design reusable component libraries and scalable frontend architectures, optimize performance and accessibility, integrate with backend services, and uphold quality through testing and CI/CD. Collaborate with product and design teams, contribute to technical decisions, review code, mentor teammates, and help deliver intuitive interfaces for asset tokenization, collateral management, credentials, and related financial applications.

Designs and leads frontend architecture for real-time, conversational web experiences. Develops reusable components, responsive interfaces, APIs, testing, observability, accessibility, and secure applications. Partners with Product, UX, backend, and ML teams; leads initiatives from design through production; troubleshoots complex issues; conducts reviews; mentors engineers; and establishes standards for performance, reliability, scalability, and maintainability.

Build core web experiences across Chat, Notes, Calendar, Docs, and Sheets. Develop interactive features such as real-time messaging, collaborative editing, rich-text editing, scheduling, tables, and spreadsheets. Create reusable frontend architecture, integrate streaming AI capabilities, and ensure performance, reliability, responsiveness, and accessibility. Collaborate with product, design, backend, and AI engineering teams while independently owning features from technical design through production.

Develop and maintain React-based user interfaces and Java backend services. Write clean, tested code, debug issues, participate in code reviews, collaborate with designers and stakeholders, and assist with database queries while following best practices.

Build modern frontend applications for an AI-driven insurance platform. Responsibilities include creating multi-step quote forms with validation, quote results and comparison pages, and fast, SEO-friendly marketing pages. The role requires strong React experience, ideally with Next.js, accessibility awareness, and experience delivering serious products. Nice-to-haves include e-commerce or marketplace experience, design systems, regulated industries, and web analytics.

Design and build user interfaces using React and TypeScript, collaborate with architects, product and UX, follow Agile practices, produce reusable UI components, mentor teammates, and contribute to coding standards, architecture, and CI to continuously improve products.

The Senior Software Engineer will develop features for Phantom's web platforms, lead new product initiatives, interface with users, and contribute to team culture.

As a Senior Frontend Engineer, you'll design and develop web and mobile applications, mentor juniors, and enhance coding practices while collaborating closely with the engineering team.

The Senior Front-End Engineer will modernize and build front-end projects at Pitchup, utilizing Nuxt.js and Vue.js, while enhancing UI/UX and improving development practices.

Design and implement frontend applications using JS, CSS, React, and Flutter. Collaborate on technical specs and contribute to documentation, ensuring user experience and performance.

Senior full-stack engineer building high-performance trading systems in TypeScript and Rust. Develop real-time, data-dense React UIs with reactive state management, design distributed systems (REST, WebSockets, TCP/UDP), own end-to-end lifecycle, ensure observability and reliability, mentor peers, and support production incidents.

Develop mobile-first, responsive Vue.js frontends focused on performance and UX. Build frontend management systems, participate in code reviews and team ceremonies, mentor junior engineers, and collaborate with backend teams.

Develop server-side applications using Kotlin and Java, collaborate with teams to enhance Atlassian plugins, and ensure code quality through testing and reviews.

Lead end-to-end implementation of high-fidelity, performant, and accessible frontend features for a realtime collaborative visual canvas. Translate designs into polished interactions, optimize performance and accessibility, collaborate with PMs, designers, and backend engineers, and shape frontend best practices and design systems.

The Staff/Lead Fullstack Engineer will enhance the Mimica Webapp by architecting scalable UI components, managing large datasets, and optimizing performance while collaborating with cross-functional teams.

The Frontend Engineer will implement UI features, automate UI testing, and oversee production releases while focusing on user experience in the blockchain space.

Design and implement developer-facing UI from Figma to production using Hotwire (Turbo + Stimulus) and ViewComponents. Own the dashboard, API playgrounds, docs, marketing site, and data visualization. Optimize performance and bundle size, maintain a coherent component system, and ship polished, production-ready front-end with tests and CI/CD.