Application Engineer - ReactJS Frontend

Who We Are Worldline helps businesses of all shapes and sizes to accelerate their growth journey - quickly, simply, and securely. We are the innovators at the heart of the payments technology industry, shaping how the world pays and gets paid. Our technology powers the growth of millions of businesses across 5 continents. And just as we help our customers accelerate their business, we are committed to helping our people accelerate their careers. Together, we shape the evolution.

The opportunity As a Software Engineer – ReactJS Frontend Development, you will be instrumental in building robust, secure, and scalable frontend applications that power our payment infrastructure and customer-facing portals. You will collaborate with product, design, and backend teams to deliver high-quality user experiences, while ensuring secure coding practices and reliable performance on Linux-based environments.

Day-to-day Responsibilities

• Develop and maintain high-quality frontend features using React and modern JavaScript.
• Implement secure coding practices including input validation, authentication, authorization, and secure data handling.
• Collaborate with backend teams to integrate RESTful services and web APIs.
• Optimize applications for performance, accessibility, and responsive design.
• Write and maintain automated tests (unit/integration) and participate in code reviews.
• Ensure compliance with security standards and participate in security-focused code reviews.
• Troubleshoot environment issues and work with Linux-based deployment pipelines and tooling.
• Document design decisions, APIs, and frontend components for maintainability.

Who Are We Looking For

• 1–4 years of professional experience in frontend development with React and JavaScript.
• Strong proficiency in React (hooks, component patterns, state management) and modern JavaScript.
• Familiarity with Linux operating environments and command-line tooling.
• Understanding of secure coding practices for web applications (input validation, authentication, authorization, secure data handling).
• Experience with RESTful APIs and integrating frontend with backend services.

Perks & Benefits Shape the evolution We are on an exciting journey towards the next frontiers of payments technology, and we look for big thinkers, people with passion, can-do attitude and a hunger to learn and grow. Here you'll work with ambitious colleagues from around the world, take on unique challenges as a team, and make a real impact on the society. With an empowering culture, strong technology and extensive training opportunities, we help you accelerate your career - wherever you decide to go. Join our global team of 18,000 innovators and shape a tomorrow that is yours to own.

Learn more about life at Worldline at jobs.worldline.com

We are proud to be an Equal Opportunity employer. We do not discriminate based upon race, religion, color, national origin, sex, sexual orientation, gender identity, gender expression, age, status as an individual with a disability, or any applicable legally protected characteristics.