Senior Java Developer – TMS

Build resilient payment intelligence at scale—design and ship the Java backbone of TMS!
Warsaw-based opportunity with on-site work model (1 day WFH per week)

As a Senior Java Developer, you will be working for our client on the Terminal Management System (TMS)—a platform that manages over 300,000 payment terminals. You’ll help evolve a complex distributed architecture built with WildFly and Spring Boot, supporting distributed transactions and integrations with multiple internal and external systems.

Your main responsibilities:

• Design and implement IT solutions based on analytical and technical documentation for TMS components.

• Review analytical documentation and translate it into robust technical approaches.

• Create and maintain high-quality technical documentation for delivered features and system changes.

• Perform technical upgrades of existing systems and components to improve reliability and maintainability.

• Work with legacy code, modernize where needed, and ensure backward-compatible outcomes.

• Conduct regular application vulnerability scans and implement remediations.

• Develop, test, and support application components within a distributed environment and integration landscape.

You're ideal for this role if you have:

• At least 5 years of professional experience in Java development and application engineering.

• Very good knowledge of Java 8+ and strong object-oriented programming skills.

• Experience with independent design, implementation, documentation, and testing of application components.

• Practical knowledge of Spring / Spring Boot, Hibernate/JPA, and JEE frameworks.

• Practical experience with message queue systems, especially RabbitMQ.

• Hands-on experience with Maven, Git, GitLab, GitLab CI/CD, Jenkins, Nexus, and Jira.

• Knowledge of relational databases, in particular Oracle.

• Practical experience designing and consuming RESTful APIs and working on system integrations.

It is a strong plus if you have: (optional)

• Experience with distributed systems and application servers such as JBoss/WildFly.

• Knowledge of scanning tools such as Fortify and Sonatype.

Language Required for the role :

• Polish (required) — fluent/strong working proficiency

• English (required) — communicative level (B2)

Eligibility for the role :

• Only candidates with an existing legal right to work in Europe will be considered for this role.

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• Interested? Apply now and include your CV (preferably in English) along with a statement confirming your consent to the processing and storage of your personal data.