APEXX Global - Frontend Engineer

• Design, build, and maintain robust, lightweight, high-performance JavaScript/TypeScript SDKs and payment components that integrate seamlessly into diverse merchant environments, with rigorous attention to isolation, backwards compatibility, browser behaviour, security, accessibility, and performance. • Build and evolve sophisticated merchant- and internal-facing web applications, creating polished, responsive, and highly performant experiences across complex workflows, large datasets, dashboards, and data visualisations. • Raise the bar for frontend engineering and visual craftsmanship, translating product and design intent into precise, accessible, and intuitive experiences that perform consistently across browsers, devices, and merchant environments. • Work confidently across the frontend/backend boundary, understanding underlying services, APIs, and data flows and, where appropriate, designing and building Backend-for-Frontend services to create performant and maintainable frontend experiences. • Engineer for quality throughout the delivery lifecycle, using appropriate automated testing, performance optimisation, observability, and debugging practices to build reliable software and resolve complex production issues. • Version, document, and publish client libraries with strong semantic-versioning and backwards-compatibility discipline, and contribute to clear integration guidance that enables merchants to adopt and integrate APEXX capabilities successfully. • Collaborate closely with Product, Design, and Engineering to shape well-architected solutions, challenge assumptions, make sound technical trade-offs, and continuously evolve our frontend architecture, engineering practices, and technology choices. • Proven track record as a Frontend Engineer building sophisticated, high-performance web applications, ideally including both complex application interfaces and software embedded into third-party environments. • Deep knowledge of JavaScript/TypeScript, HTML, CSS, the DOM, browser APIs, and the fundamentals of how modern web applications behave and perform - beyond expertise in any individual framework or library. • Strong experience with modern frontend frameworks, preferably React, together with sound understanding of component architecture, application state, data fetching, frontend performance, and modern build and delivery practices. • Experience building performant, data-intensive user interfaces and visualisations, with a strong understanding of how to present and interact with large datasets without compromising responsiveness or usability. • Exceptional attention to detail and a strong sense of visual craftsmanship, with a track record of translating designs into polished, pixel-accurate, responsive, and accessible interfaces. • Strong understanding of browser and web security fundamentals, including cross-origin behaviour, iframes, CSP, CORS, and secure handling of sensitive data, together with a commitment to building accessible experiences to WCAG standards. • Strong software-engineering judgement and problem-solving skills, with the ability to understand backend architecture, APIs and data flows, make pragmatic technical trade-offs, and quickly learn unfamiliar technologies and domains. • GREAT TO HAVE: • Experience building framework-agnostic SDKs, hosted fields, checkout components, or other software designed to run reliably within third-party websites and applications. • Experience with Backend-for-Frontend patterns and server-side technologies such as Node.js, or deeper experience working across frontend and backend architecture. • Experience in payments, fintech, or e-commerce, particularly with PCI DSS, payment forms, security-sensitive customer journeys, or other high-scale transactional environments.