Top Front End Developer Jobs in Belfast

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.

Build and maintain React/Next.js TypeScript frontend applications powering checkout, payments and policy renewal flows. Translate designs into responsive interfaces, integrate with APIs and payment providers, optimize performance, implement transactional workflows, and contribute to reusable frontend architecture and engineering best practices.

Build responsive, high-performance frontend applications using React, Next.js and TypeScript; translate UX designs into scalable component-based interfaces; integrate with backend APIs and workflow engines; optimise performance, maintain reusable components, participate in code reviews, and collaborate with product, design and backend teams to deliver AI-enabled workflow automation features.

Build fast, scalable React/Next.js frontend applications for customer-facing and internal AI-powered insurance workflows. Translate UX requirements into responsive interfaces, integrate with backend APIs and AI services, optimize performance, create reusable components, participate in code reviews, and collaborate with product, design, backend engineers and QA to shape frontend architecture and technical decisions.

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

Build and maintain scalable frontend components for a SPA, optimize performance and SEO, write tests, follow SOLID/OOP principles, collaborate with Product/Design/Backend, and use modern build pipelines and tooling.

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 Frontend Engineer will design and maintain backend systems for growth initiatives, focusing on A/B testing frameworks, microservices, and performance metrics, while collaborating cross-functionally.

As a Senior Frontend Engineer, you'll deliver web-based AI modeling tools, optimize frontend architecture, and collaborate on complex UI components.

As a Senior Frontend Engineer, you'll lead the development of web apps using React and TypeScript, creating intuitive, data-driven UIs, while implementing best practices and performance optimization.

As a Senior Frontend Engineer, you'll create production-ready web components using React and TypeScript, optimize performance, and collaborate with teams to deliver complex UIs for AI applications.

As a Senior Frontend Engineer, you'll design and deliver React/TypeScript components, optimize performance, and lead frontend architecture for complex web apps.

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

Build responsive, production-grade web UIs and data-dense dashboards from design prototypes. Implement interactive visualizations, integrate with REST/GraphQL backends, manage state and performance, write frontend tests, and collaborate with designers, backend and data engineers to deliver polished, accessible, and performant cybersecurity and analytics products.

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.

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

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

We are seeking a Senior Software Engineer with a strong focus on front-end UX to lead production applications using C# and .NET. Responsibilities include design decision-making, mentoring, CI/CD maintenance, and promoting best practices in a collaborative Agile environment.

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.

As a Senior Frontend Engineer, you'll develop seller-facing products, enhance the design system, and ensure high-quality TypeScript code delivery, while collaborating with teams.

Senior Software Engineer will be a founding member of a Learner Experience pod owning end-to-end delivery: discovery, solution design, production, iteration and outcome measurement. Work across full stack with strong front-end/UX focus, use AI-assisted development, uphold TDD and code review standards, coach peers, and collaborate closely with non-technical stakeholders to shape impactful edtech features.

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.

The Software Engineer will develop high-quality responsive UIs for web/mobile, conduct user research, optimize applications, troubleshoot issues, and conduct code reviews.

The Senior Frontend Engineer will develop features for a mobile application, collaborate with design and backend teams, and maintain code quality.

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.