Frontend Developer

Frontend Engineer - Belfast Job Summary Are you a frontend engineer looking to work on genuinely cutting-edge technology, and to help build a brand-new UI team? My client is a rapidly scaling unicorn, now valued at $3.8 billion after closing a $400 million Series C in October 2026. They're building a next-generation cloud security platform, using advanced eBPF-powered sensors to deliver real-time threat protection across modern cloud environments. Their UI team is brand new, with 2-3 frontend engineers being hired, so you'll join at the very beginning and have a real hand in shaping how it works and the standards it sets. It's part of a major growth push in Belfast, with 20+ engineering roles open right now. This is a dedicated frontend role, not a full-stack one. They're looking for engineers who genuinely want to specialise in frontend and are very technical. Job Description As a Frontend Engineer, you will be responsible for designing, building and evolving the frontend of a cloud-native security platform. You will work closely with product managers, designers and backend engineers to deliver high-performance, scalable user interfaces, in a team that embraces modern, AI-assisted development. Key responsibilities include: Designing and developing frontend components from concept through to production Leading frontend implementation across key product features Contributing to architectural and technical design decisions Championing product quality and user experience across the platform Defining and collaborating on API design with backend and platform teams Optimising application performance, scalability and reliability Participating in code reviews and design reviews to maintain engineering standards Personal Specification Essential Criteria 3+ years' experience in frontend engineering Strong commercial experience with React and TypeScript Solid understanding of core web technologies (HTML, CSS, JavaScript) Experience working with APIs and collaborating with backend teams Exposure to CI/CD pipelines and modern development practices A genuine wish to specialise in frontend, and a passion for building clean, high-performance user interfaces Desirable Criteria Experience with WebGL or similar graphics / visualisation libraries Background in cloud-native or security-focused products Familiarity with modern frontend tooling and frameworks Experience working with design systems and responsive UI Why This Role Stands Out Join a $3.8 billion unicorn during a major growth phase, with 20+ engineering roles open in Belfast Help build a brand-new UI team and set its direction from day one Work on a genuinely innovative cloud security platform Exposure to advanced technologies including eBPF and real-time threat detection A strong engineering culture with real technical ownership, and no egos The opportunity to influence both product direction and technical architecture The Process A 4-stage interview process, including a hands-on coding round Benefits Competitive salary (dependent on experience) 25 days' annual leave plus statutory holidays Equity and share options Hybrid working model, with 3 days per week in the office and sensible flexibility when you need it A high-impact, fast-growing company with clear progression opportunities Skills: Frontend React Security Engineer

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