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)