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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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