Java Developer

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.