Java Backend Developer

We are looking for a Java Backend Developer to join a production-critical backend platform within the payments domain. The role focuses on building and maintaining high-performance backend services in a regulated, high-scale environment, supporting transaction processing, settlements, financial reporting, and integrations with internal and external systems. Strong hands-on Java experience and comfort working with mature, mission-critical systems are essential.

• Design and develop backend services using Java 17+
  
• Build scalable components supporting transaction data, settlements, and reporting
  
• Integrate backend services with relational databases and internal financial systems
  
• Develop secure REST APIs aligned with compliance and security standards
  
• Collaborate closely with product owners, analysts, architects, and QA teams
  
• Optimise system performance, reliability, and data processing efficiency
  
• Participate in code reviews, testing, and continuous improvement activities
  
• Support platform modernisation and resolve production issues
  
• Contribute to clean code practices and long-term platform scalability

Requirements

• 3–5 years of commercial Java backend experience
  
• Strong knowledge of Java 17+ and modern backend frameworks
  
• Hands-on experience with relational databases (SQL; Oracle / PL/SQL preferred)
  
• Experience working with microservices and distributed systems
  
• Solid understanding of REST API design and system integrations
  
• Experience working in Agile delivery teams
  
• Good communication skills and ability to work in international environments
  
  Nice to have
  
• Experience in fintech, payments, banking, or other regulated domains
  
• Exposure to CI/CD pipelines, DevOps practices, or containerised environments
  
• Experience with messaging or event-driven architectures
  
• Background in high-volume or real-time systems

Benefits

• Solid, competitive salary
  
• Work in a multinational environment on international projects
  
• Comprehensive healthcare
  
• Long-term B2B contract with a stable project pipeline
  
• Hybrid working model (remote with 1 day per week in the Warsaw office)