Backend Engineer (Java)

## About the Role Worldline is seeking a **Backend Software Engineer (Java)** to join its development team in Biel/Bienne, Switzerland, working on software that powers cashless payment processing across Switzerland and international markets. The role focuses on designing, developing, testing, and maintaining reliable backend applications using modern technologies. You will work within an agile, DevOps-oriented, cross-functional squad distributed across Switzerland and Italy. The position involves building payment functionalities, collaborating with product owners and business engineers, maintaining production systems, and contributing to application performance, scalability, reliability, monitoring, and deployment infrastructure. ## Key Responsibilities * Design, build, test, and maintain new features for cashless payment applications. * Develop backend solutions using state-of-the-art technologies. * Work on the backbone of payment services processing more than **20 million transactions per day**. * Collaborate with product owners and business engineers to translate client needs into technical solutions. * Write clean, well-documented, and testable code. * Participate in code reviews and maintain software quality standards. * Own deployment, monitoring, and incident response for assigned components. * Provide **3rd-level support** and participate in **on-call duty**. * Improve application performance, scalability, reliability, and monitoring. * Contribute to optimizing deployment infrastructure. * Participate in the evolution of the technology roadmap. * Work effectively within an agile, cross-functional, distributed DevOps team. * Support operational excellence and production reliability. ## Required Qualifications * Higher education in **Information Technology**, such as a university degree or equivalent. * Strong programming proficiency in **Jakarta EE**. * Fluency with **relational databases**. * Experience with: * Git * Maven * Quarkus * Docker * Kafka * Linux * Ability to break down complex technical problems and drive solutions. * Ability to work effectively under pressure, including during major production outages. * Fluent in **English**. ## Preferred Qualifications * French, German, or Italian language skills. * Experience in the **payments** or financial technology industry. * Experience working with high-volume transaction processing systems. * Experience in agile and DevOps environments. * Familiarity with production monitoring, incident response, and application reliability practices. ## Skills & Competencies * Java * Jakarta EE * Backend Software Development * Relational Databases * SQL / Database Technologies * Git * Maven * Quarkus * Docker * Kafka * Linux * Agile Development * DevOps * Distributed Systems * Payment Technology * Cashless Payments * API / Backend Services * Software Testing * Code Reviews * Application Monitoring * Incident Response * 3rd-Level Support * On-Call Support * Performance Optimization * Scalability * Reliability Engineering * Deployment Infrastructure * Problem Solving * Cross-Functional Collaboration ## Education & Experience * Higher education in Information Technology, university degree, or equivalent. * The source listing does not specify a minimum number of years of professional experience. * Strong professional programming experience with Jakarta EE and relational databases is required. * Experience with Git, Maven, Quarkus, Docker, Kafka, and Linux is required. ## Work Arrangement & Schedule * **Remote / Mobile Working within Switzerland** * Listed location: **Biel, Bern, Switzerland (Remote)** * Flexible working time models. * International remote working is possible for up to **25 days per year**. * The role operates within a distributed team across Switzerland and Italy. * **On-call duty** is part of the role. * Specific shift and weekend requirements are not specified. ## Compensation & Benefits * Listed compensation: **EUR 110–140** in the job platform's compensation field. * Mobile working within Switzerland. * Flexible working time models. * Up to 25 days per year of international remote working. * Financial support for public transport tickets. * Access to an employee restaurant. * Comprehensive continuing education programs. * Additional family-oriented offers. * Potential participation in the Innovation Festival. * Employee Share Program. * International corporate culture. * Training and professional development opportunities. ## Additional Information The role supports payment applications operating at significant transaction volume, with applications processing more than **20 million transactions every day**. The position combines backend engineering with production ownership, operational excellence, reliability, and continuous improvement. Worldline states that it is an Equal Opportunity employer and does not discriminate based on legally protected characteristics.