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.

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 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 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.

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.

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.

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.

Develop, test, and maintain user interfaces using React.js while supporting backend services in Java. Write clean code, perform debugging, participate in code reviews, create unit/integration tests, assist with database queries, and collaborate with designers, developers and stakeholders to deliver features following Agile practices.

Build and optimize React/TypeScript applications for AI-driven video forensic workflows. Implement type-safe APIs with tRPC, develop AWS Lambda functions and AWS CDK infrastructure, work across Vite and Next.js monorepos, write tests with Vitest and Playwright, optimize performance and bundle sizes, enforce strict TypeScript and Zod-based validation, and collaborate with backend, product, and design teams.

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

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

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.

Full-Stack Engineer responsible for developing and maintaining front-end and back-end components, collaborating on product solutions, and improving user interfaces.

Develop and maintain Ubegos frontend products: mobile/web quest experiences, user and creator dashboards, admin panel, marketing features, and third-party integrations. Work in one-week Scrum sprints, perform code reviews, contribute to software architecture, and use modern frontend frameworks, relational databases, and AI-assisted coding tools.

Work as part of an agile team to design, develop, document and test frontend features for a mission-critical call-taking and dispatch platform. Build high-quality JavaScript/React/TypeScript user interfaces, collaborate with product and test engineers, follow modern development practices (SOLID, Git, pull requests), and support an expansion product while occasionally travelling to UK offices.

The Software Engineer will design and maintain payment processing systems, mentor other engineers, and ensure security in client transactions within the crypto ecosystem.

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

The Senior Software Engineer will enhance user experiences in crypto wallets, focusing on collaboration, performance, and delivering quality products.

As a Frontend Software Engineer at Twilio, you will design, develop, and deploy new features for the Twilio Console platform, manage code through GitHub, and collaborate within a SCRUM team to improve the platform's capabilities while maintaining high engineering standards.

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.