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)