Principal Frontend Engineer Location: Belfast/ Remote First Engagement: Permanent Hiring Timeline: Q1 2026 The Opportunity The start of 2026 is an ideal time to join my client as a Principal Frontend Engineer. The Belfast engineering hub continues to scale, and this role sits at the core of how complex, real world operational products are built and evolved. This is a senior technical leadership role focused on frontend architecture, standards, and delivery. You will work on large scale platforms used daily across physical and digital environments, partnering closely with product, backend, and design leaders to shape long term frontend strategy. The Role As Principal Frontend Engineer, you will own frontend technical direction across multiple teams. You will remain hands on while providing architectural leadership, mentoring senior engineers, and ensuring high quality, scalable UI solutions are delivered consistently. What You Will Do Lead frontend architecture across large React based applications Define and uphold engineering standards, patterns, and best practices Build and maintain scalable component libraries and shared frontend foundations Partner with product and design to translate complex workflows into intuitive user experiences Drive performance, accessibility, and maintainability across the frontend estate Mentor senior engineers and support technical growth across teams Collaborate closely with backend teams to ensure clean API integration Influence long term platform and technical roadmap decisions What You Bring Extensive commercial experience with React and TypeScript Proven experience leading frontend architecture at scale Strong understanding of component driven development and state management Experience building and maintaining design systems or shared UI libraries Solid grasp of performance optimisation and accessibility standards Comfort operating as a technical leader in cross functional teams Strong communication skills and stakeholder confidence Why Join Now This is a rare opportunity to join a client we have worked with for the past 3 years. This client is at a point where senior frontend leadership is critical. Joining in Q1 gives you immediate influence and long term ownership within a world class engineering organisation. Skills: JavaScript AWS TypeScript Benefits: Bonus