Performance Tester

🏢 Summary: Hybrid B2B opportunity to build and test scalable Java backend services for customer-facing digital banking platforms across the Nordic region. The role covers the full product lifecycle in an Agile team, from technical design and implementation to automated testing, continuous improvement, and operational support, with daily use of AI-powered development tools. 🗂️ Requirements: 5+ years of development and testing experience, Java 21+ experience, REST API and microservices architecture experience, Spring Boot 3.x and Spring WebFlux knowledge, Hibernate, Git, Maven, and Jenkins experience, Oracle DB, DB2, and SQL experience, SOLID principles and modern software engineering practices, Automated unit, integration, API, and performance testing experience, JUnit 5, Cucumber, and WireMock experience, Splunk monitoring and troubleshooting experience, AI tools in software development workflows, Agile collaboration and communication skills 📃 Skills: Java, REST, Microservices, SpringBoot, WebFlux, Hibernate, Git, Maven, Jenkins, Oracle, DB2, SQL, SOLID, JUnit, Cucumber, WireMock, Splunk, AI, Agile 🏢 Description: Salary: 1000-1200 PLN/day on B2B Work model: hybrid from Warszawa (3 days per week from the office) Why choose this offer? You can expect a flexible work organization The international work environment will give you the opportunity to interact with the English language on a daily basis Scandinavian organizational culture will provide you with work-life balance, you will gain time for additional training (financed by Jit) The Jit community will bring you a nice time during regular integration meetings Project Join our Channels-Business unit and help shape the future of digital business banking across the Nordic region. Our teams deliver innovative web and mobile banking solutions used by customers in Denmark, Finland, Sweden, and Norway , while continuously evolving the next generation of digital banking services. You will become part of a vibrant Digital Scalable Model Hub , primarily based in Warsaw, working within one of seven agile teams. Together with developers, testers, analysts, and business stakeholders, you will contribute to the design, development, testing, and enhancement of customer-facing banking products. This role offers an opportunity to influence solutions from concept to production while working on a modern, large-scale banking platform and leveraging the latest AI-powered development practices . Responsibilities you'll have Design, develop, test, and maintain backend services supporting digital banking platforms Take ownership of backend testing activities within an agile team, ensuring high-quality, reliable, and scalable solutions Collaborate closely with business stakeholders to understand requirements and contribute to technical solution design Support analysis activities by translating business needs into effective technical solutions Utilize AI-powered tools in daily development, testing, and delivery processes Contribute throughout the entire product lifecycle, including technical design, implementation, continuous improvement, and operational support Work within a cross-functional Agile team to deliver customer-focused digital banking services Expected competences and knowledge At least 5 years of experience in both development and testing activities Strong experience in Java 21+ , REST APIs , and microservices architecture Practical knowledge of Spring Boot 3.x , Spring WebFlux , Hibernate , Git , Maven , and Jenkins Experience working with Oracle DB , DB2 , and SQL databases Solid understanding of SOLID principles and modern software engineering practices Proven experience with test automation , including unit, integration, API, and performance testing Experience with JUnit 5 , Cucumber , and WireMock Familiarity with monitoring and troubleshooting tools such as Splunk Experience using AI tools in software development workflows Strong communication and collaboration skills in Agile environments Nice to have: Knowledge of Reactive Programming Experience in frontend development ISTQB Foundation Certification Knowledge of Gherkin Technologies you'll work with Java 21+ Spring Boot 3.4 Spring WebFlux REST APIs Microservices Hibernate Git Maven Jenkins Oracle DB / DB2 / SQL JUnit 5 Splunk Cucumber WireMock Nice to have: JavaScript TypeScript Angular 2+ AngularJS Playwright qTest Gherkin Reactive Programming Client – why choose this particular client from the Jit portfolio? Jit Team has had an over-decade-long relationship with the leading financial group in the Nordic countries, and we are privileged to be our client's premier partner in Poland. At present, over 200 Jit personnel are engaged in the completion of more than 60 projects for this Norwegian major provider of financial services with a global presence and a strong focus on modern technology. Our customer's work atmosphere is epitomized by the Scandinavian culture , which is conducive to people who place emphasis on work-life balance and feedback culture . Furthermore, all projects are executed in international teams, giving constant exposure to the English language. About Jit Team The Human Factor of IT - it’s not just a slogan, it’s a philosophy. The foundation of Jit Team is people, which is why we prioritise you. We employ over 770 experienced experts , to whom we offer developmental projects, a wide range of benefits, and a proprietary professional development programme. Together with clients from around the world, we create innovative IT solutions delivered by highly specialised and efficient teams. Behind our maxim are also charitable and educational activities. We support schools, universities, and educational institutions by conducting workshops, running educational projects, sponsoring events, and donating learning equipment. We offer internships that help launch careers in IT. We support water rescuers and hospitals by providing the necessary equipment. We also support numerous charitable organisations helping people in need, children, and the elderly. We are a Polish company and we share what we have achieved over more than 15 years of activity. By supporting local initiatives, we contribute to the circulation of good energy.