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.

Responsibilities

• 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)