Senior Java Developer | Baltic States and Poland Citizen (remote) | Contract

Be part of a Core Banking team modernizing and supporting mission-critical services for a leading banking platform. You will deliver new features, reduce technical debt, and ensure regulatory compliance using Java 11/17+ , Spring Boot , REST APIs , and microservices on highly available, enterprise-scale systems. Expertise with Kafka , Oracle Database , and event-driven architectures is key to maintaining resilient integrations with digital channels. Key Responsibilities: Design, build, and maintain Java microservices with Spring Boot and JPA/Hibernate. Develop and integrate REST/SOAP services and Kafka -based messaging solutions. Optimize SQL queries and ensure performance on Oracle Database. Contribute to core banking transformation and legacy-modernization initiatives. Collaborate in Agile/Scrum teams, providing technical leadership and code reviews. Ensure high availability, resilience, and regulatory compliance across distributed systems. Must-Have Requirements: 5+ years of enterprise Java development (Java 11/17+). Deep Spring Framework / Spring Boot expertise. Proven experience with REST APIs , microservices , and event-driven architectures. Hands-on with JPA/Hibernate , Maven or Gradle. Proficiency in Kafka (or similar messaging) and Oracle Database performance tuning. Solid grasp of core banking architecture , integration patterns, and high-availability design. Experience in production-critical financial environments and Agile/Scrum delivery. Fluent English plus strong analytical and stakeholder-communication skills. Nice to Have: Exposure to core banking platforms such as Oracle FLEXCUBE , Temenos T24 , Finacle , Mambu , or Thought Machine. Experience with Git , CI/CD pipelines, Kubernetes/OpenShift , and AWS / Azure / GCP. Knowledge of Domain-Driven Design (DDD) , automated testing, and ISO 20022 / SWIFT standards. Background in core banking migration or transformation programs.