We are FIS. Our technology powers the world's economy and our teams bring innovation to life. We champion diversity to deliver the best products and solutions for our colleagues, clients and communities. If you're ready to start learning, growing and making an impact with a career in fintech, we'd like to know: Are you FIS?

About the Role

As a Non-Functional Engineer Lead, Quality, you lead the strategy and execution of performance, reliability, and resilience engineering for enterprise-grade applications. You ensure systems meet demanding non-functional requirements across scale, availability, and security in a regulated payments environment. Success is measured by predictable performance, high availability, and production stability across complex distributed systems. This role is based in Warsaw, Poland.

What You Will Be Doing

• Lead non-functional quality strategy across performance, scalability, resilience, and availability.
• Design and execute performance, load, stress, and endurance testing for critical applications.
• Analyze system behavior using monitoring and observability tools to identify bottlenecks.
• Partner with engineering and architecture teams to embed quality early in the SDLC.
• Drive performance optimization across Java applications, databases, and middleware.
• Establish CI-driven quality gates using automated unit, integration, and non-functional tests.
• Validate application behavior across application servers and containerized environments.
• Troubleshoot complex production issues and lead root-cause analysis.
• Mentor engineers on non-functional testing practices and quality engineering standards.

Required Qualifications

• Extensive hands-on experience in application development and quality engineering.
• Strong expertise in Java (JDK 8/17), JEE, Maven, Hibernate, EJB 3.1, MQ, SQL, REST, XML, XSD, and JSON.
• Proven experience monitoring and analyzing application performance characteristics.
• Advanced skills in designing performance, high availability, and resilience tests.
• Experience with continuous integration using Jenkins and automated test frameworks.
• Solid knowledge of application servers including WebSphere, WebLogic, JBoss, and Open Liberty.
• Strong database expertise with Oracle or PostgreSQL, including performance tuning.
• Proficiency working in Linux-based environments and container platforms.

Preferred Qualifications

• Experience with Docker and Kubernetes in production environments.
• Knowledge of Kafka or event-driven architectures.
• Experience in payments domains such as SEPA or SWIFT messaging.
• Advanced REST API design and optimization experience.
• Deep PostgreSQL performance and scalability expertise.

What We Offer you

• At FIS, you can grow your career as far as you want to take it. Here's what else we offer:
• Opportunities to make an impact in fintech
• Personal and professional learning
• Inclusive, diverse work environment
• Resources to give back to your community
• Competitive salary and benefits

Privacy Statement

FIS is committed to protecting the privacy and security of all personal information that we process in order to provide services to our clients. For specific information on how FIS protects personal information online, please see the Online Privacy Notice.

Sourcing Model

Recruitment at FIS works primarily on a direct sourcing model; a relatively small portion of our hiring is through recruitment agencies. FIS does not accept resumes from recruitment agencies which are not on the preferred supplier list and is not responsible for any related fees for resumes submitted to job postings, our employees, or any other part of our company.

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