Senior / Expert Java Integration Developer

Senior / Expert Java Integration Developer (Banking)
Senior / Expert Java Integration Developer (Banking)
📍 Location: Warsaw or Gdańsk (hybrid – 2–3 days per week in the office)
💼 Contract: B2B
💰 Rate: up to 165 PLN/h
📅 Project duration: August 2026 – January 2027 (with possible extension)
🗣 Language: English (Professional)
👥 Open positions: 2
For our international client from the banking sector, we are looking for an experienced Senior / Expert Java Integration Developer to join a growing engineering team responsible for developing and modernising backend integration components supporting Safekeeping and Corporate Actions platforms.
The project is undergoing significant expansion as part of a long-term strategic transformation, including migration of business processes and increased transaction volumes. You will participate in redesigning existing integrations, building modern Java microservices, and integrating critical banking systems.
You'll join an experienced Scrum team working in a collaborative international environment with architects, analysts, QA engineers, and infrastructure specialists.
– Design, develop and maintain Java-based backend applications and integration services
– Develop modern microservices using Spring Boot
– Build and enhance integrations between banking systems using REST APIs, Kafka and IBM MQ
– Participate in application architecture improvements and legacy modernization
– Analyze business requirements, technical documentation and system dependencies
– Support deployment planning and production issue investigation
– Develop automated unit and integration tests
– Participate in code reviews and promote engineering best practices
– Collaborate with international Agile/Scrum teams
– 5+ years of commercial experience in Java backend development (10+ years for Expert level)
– Strong knowledge of Java and Spring Boot
– Experience with Spring Integration
– Practical experience with REST APIs and microservices
– Strong SQL skills and experience with relational databases (Oracle preferred)
– Experience with Kafka and/or IBM MQ
– Maven, Git and CI/CD pipelines
– JUnit and Testcontainers
– Experience analyzing production issues, logs, integrations and system flows
– Professional level English
– Banking or capital markets experience
– Experience with custody, settlement or corporate actions platforms
– Kubernetes and containerized applications
– Cloud-native application design
– Test automation and static code analysis
– Experience with AI-assisted development tools
– Experience building applications integrated with Kafka
– International banking project
– Modern technology stack and large-scale enterprise systems
– Opportunity to influence architecture and modernization initiatives
– International Scrum environment
– Competitive B2B rate
– Stable cooperation with the possibility of project extension
– Hybrid work model (Warsaw or Gdańsk)