Java Developer

About the Project  Our client is a European payments organization undergoing a major digital transformation focused on modernizing its core transaction‑processing platform. The team is building a modern microservices‑based environment designed to increase scalability, reliability, and performance across high‑volume payment operations.   Technology stack in use: Java 21 (Spring Boot 3), OpenShift / Kubernetes, Apache Kafka / Rabbit MQ for streaming and queuing, MongoDB, Oracle Database, multiple DevOps tools for development, automation and monitoring.Work mode: hybrid, 3-4 per week from Cracow office    Key Responsibilities: ·       Design, develop and support testing payment services features together with the team. ·       Resolve issues by troubleshooting and root cause analysis and support in production issue analysis when needed. ·       Ensure high quality via unit testing and code reviews. ·       Demo and document the results of work in demo sessions.   Required Experience & Skills: ·       At least 3 years on similar position ·       Technical knowledge in at least some of the technologies used is needed. ·       Java development skills are the most relevant. ·       Understanding of microservices architecture and distributed systems. ·       Familiarity with API design principles. ·       Fluent English    Additional Valuable Skills: ·       Experience in designing and implementing high-throughput, low-latency systems capable of handling large data volumes ·       Groovy, Maven, Jenkins ·       Knowledge of the Card Processing domain ·       Documentation and use of Jira/Confluence ·       Excellent communication and coordination skills We offer • Ongoing support from a dedicated agent who is caring about your project continuity, contact with clients, necessary formalities, work comfort, and development.  • Career Development Program – advice on career planning based on the latest trends and market needs in IT, including consultations with career agents and mentors.  • Access to 7N Learning & Development – a development and educational platform offering webinars, a library of articles and industry reports, and frequent invitations to both one-time and recurring events focused on technical, business, and lifestyle topics.  • Spectacular events, both for you (e.g., annual Kick-Off trip, Christmas parties, or Summer Olympics sports events) and for your loved ones (e.g. family picnics),  • Professional growth Professional growth beyond your current project. You can actively engage in knowledge sharing through the 7N Services offering, designed for 7N clients.  • Connections and access to the expertise of top IT professionals in the market – the average professional tenure of our consultants in Poland is over 10 years,  A complete benefits package, including funding for medical care, life insurance, sports cards for you and your loved ones, as well as discounts in stores in Poland and abroad