Senior Java Developer

Senior / Expert Java DeveloperAbout the ClientOur client is a major international player in the banking industry. You will be joining their IMSecurities department, contributing to a large-scale technological transformation involving the migration of massive business flows and volumes projected through 2027–2029.The RoleWe are looking for a Senior or Expert Java Developer to design, build, and modernize backend integration components for a core Safekeeping and Corporate Actions platform. You will be joining an expanding, agile team (scaling from 8 to 15 developers), working hands-on with the code while occasionally stepping up to lead analysis and deployment orchestration.What You Will DoDesign, develop, test, deploy, and support Java-based microservices and integration components.Connect internal security systems with other banking infrastructure using event-driven architectures.Analyze business requirements, document dependencies, and troubleshoot complex production issues.Contribute to the team's growth by sharing knowledge, promoting best development practices, and mentoring junior colleagues.Work in a Scrum environment (JIRA), filling in the blanks in requirement analysis and test case preparation when bottlenecks occur.ExpectationsExperience: Min. 5 years (for Senior) or 10+ years (for Expert) of Java backend development in large-scale enterprise environments.Core Stack: Java, Spring Boot, Spring Integration.Architecture & Integrations: REST services, microservices, and integration patterns.Messaging: Event-driven integration platforms (preferably IBM MQ and Kafka).Databases: Strong SQL and relational database knowledge (preferably Oracle).DevOps & Testing: Maven, Git, CI/CD pipelines, and automated testing (JUnit, Testcontainers).Languages: Fluent English (both written and spoken).Nice to HavePrevious experience in banking, trading, custody, settlement, or other regulated domains.Familiarity with cloud-ready application design and containerization (Kubernetes).Experience modernizing legacy systems or building layers around vendor platforms.Practical use of AI-assisted development tools and static code analysis.What We OfferSalary: 140 - 170 PLN / hour (B2B).Type of Work: Hybrid (50% remote / 2-3 days a week in the office).Location: Gdańsk or Warsaw.