Top Front End Developer Jobs in Belfast

Lead frontend work on a TypeScript/Angular product, owning component architecture, state management, performance, and tests. Build data-dense UIs and Storybook-driven components, ship agentic (LLM) features, shape APIs and implement backend Java endpoints, write SQL, mentor engineers, and work directly with product, design, and customers to deliver end-to-end features.

Build a scalable, component-based design system from Figma designs, creating reusable, accessible, mobile-first UI components for multi-site consistency. Ensure cross-browser compatibility, performance optimization, WCAG compliance, documentation for Umbraco CMS handover, and collaborate within Agile teams.

Develop and maintain responsive, high-performance web systems using Drupal 10. Build scalable, reusable front-end code, implement component-based theming, optimize for mobile and SEO, and collaborate with internal and external partners to deliver a new organizational website while maintaining brand consistency.

Develop and maintain frontend features for charity websites and digital products using clean, efficient code. Collaborate with an international team, participate in code reviews, ensure performance and responsiveness, and troubleshoot frontend issues.

Lead front-end technical strategy across multiple teams for a complex, data-dense merchant platform. Own architecture, component systems, state management, performance, accessibility, and front-end observability. Mentor engineers, drive cross-team alignment, and partner with Product, Design, and backend engineers to deliver a cohesive merchant experience including the Primer AI Companion.

Develop, test, and deliver front-end product features using React and TypeScript. Participate in Agile ceremonies, contribute to a component library, respond to production incidents, support release/deployment activities, and maintain documentation. Collaborate on requirement analysis and implement changes with attention to UX/UI and quality.

As a Frontend Engineer, you'll craft user interfaces, write engineering requirement documents, build test suites, and integrate analytics for product success.

Design and evolve frontend platform primitives for a canvas-based workflow builder, improve real-time collaboration, optimize rendering and performance, own architecture and modularization, drive RFCs, mentor peers, and collaborate cross-functionally to enable scalable, high-performance user experiences across cloud and self-hosted deployments.

Lead the design and implementation of core authentication infrastructure at Phantom, focusing on secure authentication systems, secrets management, and API integrations.

Lead front-end engineer on the Mapper Team building scalable data-visualization and real-time multi-user front-end features. Own end-to-end projects, contribute to architecture and processes, mentor peers, participate in hiring, and deliver high-performance, testable, maintainable UI code.

The role involves developing high-quality Vue.js applications, creating interactions, collaborating with back-end engineers, and writing tests.

Owner of the asset discovery experience across tokens, perpetuals, and prediction markets. Design, build, and scale features for web, mobile, and browser extension platforms. Lead initiatives to add blockchain support and new products, interface with users and developers for feedback, and help grow and hire a high-performing Discovery team.

Build and ship full-stack features for North, develop autonomous agents that access sensitive enterprise data, productionize state-of-the-art models, write minimal, secure low-resource code, and collaborate with researchers to deploy performant RAG/agentic applications while prioritizing security and user experience.

Own and deliver frontend trading features across web, mobile, and browser extension platforms. Lead new blockchain integrations and product initiatives, collaborate with product, design and trading teams, interface with users and developers, and help grow the engineering team and culture.

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.

The Sr. Software Engineer (FE) will lead the development of scalable frontend applications using React. Responsibilities include systems design, testing strategy, performance optimization, AI integration, and mentoring.

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

Design and develop scalable, secure frontend web applications for connected embedded systems. Lead frontend architecture, collaborate with backend/embedded teams, implement device provisioning, telemetry visualization, and remote management UIs. Optimize performance, accessibility, and maintainability; mentor engineers, participate in reviews, and drive frontend best practices.

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.

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 Frontend Engineer will develop cross-platform applications, focusing on user-friendly healthcare interfaces, ensuring performance, accessibility, and HIPAA compliance while collaborating directly with the CEO.

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.

Looking for a Senior Front-End Developer with extensive Vue.js experience to enhance the Jibble 2.0 platform, collaborating closely with product teams.

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.