Frontend Engineer

APEXX Global; Madrid; Híbrido; EUR 65.000 - 105.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Competitive compensation

Generous time off

Work From Anywhere up to 90 days/yr

Learning & Growth

Remote to Start, Hybrid as We Grow

Local benefits package

Descripción de la vacante

APEXX Global is seeking a Frontend Engineer to build high-performance, user-focused payments surfaces. You will design lightweight JavaScript/TypeScript SDKs, rich merchant dashboards, and embedded components for diverse environments, with strong emphasis on performance, accessibility, and security.

Based remotely with a plan to move to hybrid as we grow in the region, you’ll collaborate with Product, Design, and Engineering to deliver scalable frontend solutions and maintainable code that

Formación

• Proven frontend engineer with high-performance web apps
• Strong knowledge of JS/TS, HTML, CSS and DOM
• Experience with React and modern frontend patterns
• Experience with data-intensive UIs and visualisations
• Attention to accessibility and WCAG standards
• Ability to understand backend APIs and data flows

Responsabilidades

• 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.

Conocimientos

JavaScript/TypeScript

React

Frontend architecture

Performance optimisation

Accessibility (WCAG)

Security fundamentals

Browser APIs

Cross-origin & CSP

Herramientas

Node.js

Descripción del empleo

Job Title: Software Engineer, Frontend

Reporting to: Engineering Manager

Location: Remote initially, with plans to transition to hybrid working as we expand in the region.

About the role

APEXX is pioneering payment orchestration, transforming the global payments landscape with cutting-edge technology and innovation. As a leader in Fintech, we're committed to excellence, driving forward-thinking solutions that empower businesses worldwide.

We're looking for a Frontend Engineer to build and evolve the customer-facing surfaces of our payments platform. Your work will span lightweight, embeddable JavaScript SDKs and payment components used within merchant checkout experiences, as well as sophisticated web applications that enable enterprise customers to understand, configure, and manage their payments.

This is a hands-on engineering role combining deep frontend expertise with exceptional attention to performance, accessibility, and visual craftsmanship. You'll solve demanding engineering challenges ranging from lightweight, resilient checkout components to rich, data-intensive applications that need to remain fast, intuitive, and responsive while working with complex payment data at scale.

Payments are critical, security-sensitive customer journeys, and the software you build needs to perform reliably and precisely across browsers, devices, and assistive technologies. Whether you're building an embedded checkout component or a complex dashboard, we expect the same high standard of engineering quality and user experience.

What you'll do

• 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.

About you

• 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.

Compensation & Benefits

• Competitive Compensation: We offer competitive salaries that recognise your skills, experience, and the impact you make.
• Generous Time Off: Annual leave alongside local public holidays, giving you time to switch off and recharge.
• Work From Anywhere: Enjoy the flexibility to work remotely from eligible locations for up to 90 days per year, subject to our Work From Anywhere policy.*
• Learning & Growth: We're invested in your development, with opportunities to learn, grow, and build a meaningful career at APEXX.
• Remote to Start, Hybrid as We Grow: You’ll initially work remotely as we establish our presence in the region. As we open our regional office, this role will move to a hybrid working model, bringing our growing local team together while keeping flexibility in how you work.
• Local Benefits: As we build our team in the region, we’re developing a competitive local benefits package designed around what matters most to our people. We’ll share more details as our offering takes shape.

Who we are & where we are

APEXX is a global payment orchestration platform with teams across the UK & India, helping enterprise businesses simplify the complexity of payments. For more than a decade, we've been building technology that enables merchants to connect to the world's payment ecosystem through a single, scalable integration.

Our platform gives businesses access to 200+ acquirers, 150+ alternative payment methods, and 10+ Buy Now, Pay Later providers, helping them optimise payment performance, improve acceptance rates, and expand into new markets with confidence.

Trusted by leading global brands including Ryanair, TUI, Hotelbeds, CarTrawler, Avon, and Jet2, we're redefining enterprise payments by making them smarter, faster, and more reliable.

As we continue to grow, so do the opportunities to make an impact. Whether you're building products, solving complex engineering challenges, or supporting the teams behind them, you'll play a meaningful role in shaping the future of global payments at APEXX.

To learn more about APEXX and experience the dynamics of being part of our team, feel free to check out the provided media channels below:

LinkedIn: https://www.linkedin.com/company/apexxglobal/

Instagram: https://www.instagram.com/apexx.global/?hl=en

Main Website: https://apexx.global/

APEXX is an equal opportunities employer committed to encouraging equality, diversity, and inclusion among our employees and eliminating discrimination.

We do not accept speculative CVs or candidate profiles from Recruitment Agencies.