Senior Software Developer - Clover

We are looking for a Senior Software Developer (m/f/d) to join our Clover development team in Vienna. In this role, you will design, develop, and maintain Android-based device software as well as Java back-end applications that handle secure card payment processing for the Clover platform.

You will work closely with cross-functional and international teams to deliver high-quality, scalable software solutions, solve complex technical challenges, and actively contribute to the continuous improvement of our products and development processes., * Design, build, certify, and operate complex systems that enable millions of secure transactions per day across a large fleet of smart payment terminals

• Develop and maintain Android applications using Java and Kotlin , as well as Java-based back-end services
• Implement and enhance interfaces to payment processing systems using various protocols and data formats (e.g. XML/SOAP, TCP, HTTP/S)
• Contribute to the development and adoption of the NEXO standard for European and global payment solutions
• Add and evolve payment features such as Dynamic Currency Conversion (DCC), Google Pay, Apple Pay, and other modern payment methods
• Support device-level payment certification processes for new and existing products
• Collaborate with international certification teams, test organizations, and partners
• Work closely with server-side engineers to ensure low latency, high availability, and scalability
• Partner with QA teams to define test strategies, review code, and ensure high software quality

• A strong foundation in computer science and software engineering principles
• A Bachelor's degree in Computer Science or a related field, or equivalent hands-on experience
• Solid experience with Java, Kotlin, and SQL
• Experience building and operating complex, high-availability production systems
• Familiarity with Agile development methodologies and the full software development lifecycle (SDLC)
• Strong analytical and problem-solving skills with a high level of attention to detail
• Experience in payments, fintech, or point-of-sale systems is a strong plus
• A collaborative mindset and the ability to work effectively in international, cross-functional teams

We're Fiserv, a global leader in Fintech and payments, and we move money and information in a way that moves the world. We connect financial institutions, corporations, merchants, and consumers to one another millions of times a day - quickly, reliably, and securely. Any time you swipe your credit card, pay through a mobile app, or withdraw money from the bank, we're involved. If you want to make an impact on a global scale, come make a difference at Fiserv., Clover delivers innovative, all-in-one point-of-sale solutions that simplify and streamline daily business operations. Our platform enables businesses across industries-from cafés and boutiques to salons-to accept payments, manage inventory, and run their operations efficiently. With a strong focus on flexibility, customization, and intuitive user experience, Clover empowers merchants to grow and scale with confidence. Our solutions are powered by a secure cloud infrastructure and supported by global teams, ensuring reliability, performance, and continuous innovation.