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October 12, 2026
Senior Java Backend Developer
Senior • On-site
140 - 165 PLN/yr
Warsaw, Poland
Quick Facts
- Role focus: Backend services and REST APIs for a client portal
- Key tech: Java, Spring Boot, REST, SQL/NoSQL, Docker/Kubernetes/OpenShift
Description
Develop and maintain backend services and RESTful APIs for a client portal using Java and Spring Boot. Design and integrate data models with relational/NoSQL databases, collaborate with front-end teams on API contracts, and deploy in containerized environments. Ensure secure coding, unit/integration testing, CI/CD integration, performance optimization, and production issue resolution through an on-call/support rotation in an Agile workflow.
Responsibilities
- Develop and maintain backend services and RESTful APIs
- Design data models and integrate with relational/NoSQL databases
- Collaborate with front-end developers to define API contracts
- Build and deploy services in containerized environments
- Implement secure coding practices and unit/integration testing
- Integrate with CI/CD pipelines
- Optimize service performance, scalability, and reliability
- Troubleshoot and resolve production issues; participate in on-call/support rotations
- Participate in Agile ceremonies, sprint planning, and technical design discussions
Requirements
- 8–10+ years of backend software development experience with strong expertise in Java
- Experience with Spring Boot
- Experience building and consuming REST APIs
- Experience with containerized applications and orchestration (Docker and Kubernetes/OpenShift)
- Working SQL/database experience (relational data modeling and query optimization)
- Familiarity with CI/CD pipelines and automated testing practices
Benefits
- Work on scalable backend services for a client portal
- Participate in Agile sprint planning and technical design discussions
- Improve delivery quality through CI/CD, automated testing, and performance optimization
Nice to Have
- Messaging/event-driven architecture experience (Kafka, MQ)
- Financial services, fund administration, or transfer agency domain experience
- Cloud-native development practices
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