Senior UX/UI Engineer in Belfast

At a Glance

Strong proficiency in React, TypeScript, HTML, CSS, and SASS. Proven experience building accessible, responsive, mobile-first web interfaces. Experience with reusable component libraries and design systems. Comfortable working from Figma or Adobe XD designs through to production-ready UI. A detail-oriented engineer with a passion for polished, performant user experiences.

Who You'll Work For

Our client is a modern, cloud-native digital consultancy delivering exceptional engineering, composable commerce solutions, and data-driven digital experiences. With a highly experienced team of around 50 people, they operate on a remote-first basis and are scaling at pace.

What You'll Be Doing

As a Senior UI Engineer, you will design and build high-quality, performant, and cohesive user interfaces across a range of client projects and internal products. Collaborating closely with back-end engineers, UX designers, and visual designers, your day-to-day will include:

• Determining the structure, layout, and behaviour of modern web interfaces.
• Implementing responsive, accessible, mobile-first user interfaces using HTML, CSS, SASS, and modern JavaScript/TypeScript.
• Building robust and maintainable React applications, including SSR and statically-generated pages.
• Developing features that enhance user experience while balancing functional and aesthetic considerations.
• Ensuring consistent application of brand and design guidelines across digital products.
• Optimising web pages for speed, scalability, and smooth user interactions.
• Writing clean, readable, reusable, and testable front-end code, including front-end test suites using tools such as Jest.
• Debugging, diagnosing, and resolving functional, visual, and performance issues.
• Working closely with UX and product designers to translate design concepts into production-ready UI using Figma or Adobe XD.
• Building UI layers on top of REST and GraphQL APIs in close collaboration with back-end teams.
• Communicating design and implementation decisions clearly to both technical and non-technical stakeholders.

Your Impact

You will be a key contributor to the quality and consistency of digital experiences delivered to clients across a range of complex, modern projects. Your eye for detail and commitment to accessibility and performance will raise the bar for front-end standards across the team. As a senior voice, you will also help mentor and elevate the engineers around you, contributing to a culture of craft and continuous improvement.

What We're Looking For

Essential:

• Degree in Computer Science or a related field, or equivalent industry experience.
• Strong proficiency in core web technologies: HTML, CSS, JavaScript (ES6+), and TypeScript.
• Experience building production-grade React applications, including routing, data fetching (App Router / Pages Router), and SSR pages and components.
• Strong understanding of UI/UX design principles and how user experience influences implementation.
• Strong understanding of responsive, adaptive, and mobile-first design.
• Experience building and maintaining reusable component libraries with an emphasis on scalability, accessibility, and clean semantic code.
• Experience working with design tools such as Figma or Adobe XD.
• Understanding of SEO principles relevant to front-end engineering.
• Strong analytical and problem-solving skills.
• Excellent communication and interpersonal skills.

Desirable:

• Experience with bundling and build tools such as Webpack and Babel.
• Familiarity with accessibility (a11y) standards and best practices.
• Experience working within cross-functional product teams.
• Knowledge of performance profiling tools and approaches.
• Experience contributing to design systems or reusable component libraries.

What's In It For You

Competitive salary based on experience. Share options under an HMRC-approved EMI scheme. Remote-first working with access to co-working spaces. 25 days annual leave plus.