Java Backend Developer

Madiff; Województwo mazowieckie; On-site; PLN 100,000 - 130,000; Full time

Job summary

A leading fintech company in Poland is seeking a Java Backend Developer to work on a production-critical backend platform within the payments domain. The ideal candidate will possess strong skills in Java 17+ and REST API development. Responsibilities include designing and developing backend services, integrating with relational databases, and collaborating with cross-functional teams. This role offers a hybrid working model, with remote work and one day per week in the Warsaw office.

Qualifications

• 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.

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 with product owners, analysts, architects, and QA teams.

Skills

Java 17+

REST API Design

Relational Databases

Agile Development

Microservices

Job description

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
• Work in a multinational environment on international projects
• Long‑term B2B contract with a stable project pipeline
• Hybrid working model (remote with 1 day per week in the Warsaw office)

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