Java Developer FinTech

Senior Java Developer (TMS) Job Responsibilities: • Design and implementation of IT solutions based on the presented analytical and technical documentation; • Reviewing analytical documentation; • Creating technical documentation; • Technical upgrade for existing system; • Working with legacy code • Conducting regular scans of the application and removing vulnerabilities Job Requirements: • Fully available in the Polish time zone; • Ability to work from the office in Warsaw (weekly: 4 days at the office + 1 day WFH ); • Very good knowledge of Java 8+ and object-oriented programming issues; • Experience in independent design, implementation, documentation, and testing of application components; • Very good and practical knowledge of Spring, Spring Boot, Hibernate/JPA, and JEE frameworks; • Practical knowledge with message queue systems, particularly RabbitMQ; • Practical knowledge of tools supporting the software development process: Maven, Git, Gitlab, Gitlab CI/CD, Jenkins, Nexus, Jira; • Knowledge of relational databases, in particular Oracle; • Practical knowledge of RESTful API design; • Experience in system integration; • Experience with distributed systems; • Experience with application servers, JBoss/WildFly; · Knowledge of scanning tools (Fortify, Sonatype..) • Knowledge of English / B2; Description of the area of involvement: TMS (Terminal Management System) is used to manage a very large number of payment terminals (300k+). It gives users a uniform way to manage different terminals from different hardware vendors. TMS has a complex architecture, consisting of two components: TMS (1 WildFly instance), providing a GUI and implementing some business functions, and RTMS (3 Spring-boot instances), implementing most of the business functionalities. A gradual migration from TMS to RTMS is being carried out. The system intensively uses Spring, Hibernate, and RabbitMQ. The system has distributed transactions (different two-phase-commit, saga approaches) and a distributed cache (Hazelcast). TMS is integrated with many internal and external systems (via REST, SOAP, RMI, direct database connections, and database links). The GUI is written in GWT and GWTExt.

We are seeking a skilled and detail-oriented Java developer to join the Payments Engineering team. The candidate will work in a pod with 3-4 experienced Java developers and focus on adapting legacy applications for non-discretionary ISO20022 changes, which is a new financial messaging standard. An ideal candidate thrives in complex environments, is able to work under time pressure, is keen to understand business logic and excels at reverse engineering a complex code base to implement high-impact changes. Key Responsibilities: * Participate in requirements gathering sessions with business users * Participate in analysis, solution design and planning the work with the Engineering team * Implement and test changes, participate in code reviews, assist in UAT and code releases * Think outside the box when implementing changes and improve the stack as you go along. The position requires 4 days/week in the office. Qualifications: * A Bachelor's or Master's degree in a computational field (Computer Science, Engineering, Applied Mathematics or a related quantitative discipline) * 4+ years of relevant work experience. * A solid grasp of Java, Spring, Hibernate, and DB2 * Spring Boot — dependency injection, auto-configuration, Spring Data, Spring Security * Apache Kafka — producers, consumers, Kafka Streams (stateful processing, state stores, aggregation), and Kafka Connect * MongoDB — document modelling, Spring Data MongoDB * Maven — multi-module project management, dependency resolution, build lifecycle * Docker — containerization, image builds * RESTful API design and development * Experience with event-driven / microservices architectures in a distributed systems environment * Familiarity with Git and CI/CD pipelines (GitLab CI preferred) Preferred: * Angular * IBM MQ / JMS — queue managers, channels * Infrastructure as Code — infrastructure provisioning and management * ISO 20022 or financial messaging standards (SWIFT, CBPR+, FIN) * Python scripting * Experience in financial services, payments, or banking technology * Strong analytical skills * Ability to collaborate effectively and work in a global team * Ability to stay commercially focused, whilst not losing sight of code quality * Good communication skills. Strong work ethic, ownership, willingness to engage and be challenged