Top Front End Developer Jobs in Belfast

Build and maintain high-traffic React applications for ad-serving workflows. Translate design mocks into responsive reusable components, integrate with RESTful services, write unit-tested production code, respond to bugs and performance issues, collaborate across distributed teams, and support services in production.

Build responsive, high-performance front-end applications using React and Next.js, integrate GraphQL data flows, configure bundlers like Webpack, implement test automation (Playwright/Cypress), and collaborate with UX, ML and product teams to handle large datasets and scalability challenges.

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 design and deliver React/TypeScript components, optimize performance, and lead frontend architecture for complex web apps.

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 lead the development of web apps using React and TypeScript, creating intuitive, data-driven UIs, while implementing best practices and performance optimization.

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

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 Principal Frontend Engineer will drive Paddle's technical vision, own architectural strategy, mentor engineers, and improve frontend systems' performance and user experience.

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

As a Front-End Engineer at Paddle, you will develop the churn prevention product, enhancing customer experience via smart dunning retries and cancellation flows, while collaborating with cross-functional teams.

Design and implement new website features and modify existing ones using React and TypeScript. Optimize performance, design technical solutions, split specifications into subtasks, perform code reviews, and ensure native UX/UI fidelity. Collaborate independently and apply SOLID and FRP concepts while working in a remote, distributed team.

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 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.

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.

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 lead frontend architecture and development for scalable, secure web UIs that integrate with embedded systems and cloud platforms. Build device provisioning, telemetry visualization, and remote management interfaces; optimize performance and accessibility; mentor engineers; collaborate across backend, hardware, and systems teams to deliver end-to-end solutions.

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.

As a Senior Frontend Engineer, you will develop intuitive, high-performance interfaces for real-time conversational AI experiences.

The Frontend Software Engineer develops and enhances user interfaces using React and TypeScript, collaborating on architectural decisions and improving system performance.

The Mid-Level Software Engineer will design and build full-stack applications using Python and Node.js for backend and React for frontend, working with cloud infrastructure and CI/CD pipelines while ensuring system observability and security.

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.