Java Developer

Infotree Global Solutions Inc.; Warszawa; Hybrid; PLN 180,000 - 240,000; Full time

Job summary

Infotree Global Solutions Inc. seeks a Senior Java Developer in Warsaw to help build and maintain the TMS platform. You will design and implement IT solutions based on technical documentation, review analyses, and create technical documentation.

You will work with Spring, Hibernate/JPA, RabbitMQ, and JEE in a distributed architecture, including integration with multiple systems. The role requires Java expertise, RESTful services, and a strong command of Oracle databases.

Qualifications

• Strong Java development experience in enterprise applications.
• Experience with design, documentation, and testing of components.
• Practical knowledge of Spring, Hibernate/JPA, and JEE.
• Knowledge of message queues, especially RabbitMQ.
• Experience with distributed systems and system integration.
• English language at B2 level.

Responsibilities

• Design and implement IT solutions based on provided documentation.
• Review analytical documentation.
• Create technical documentation.
• Perform technical upgrades to existing systems.
• Work with legacy code and address vulnerabilities.

Skills

Java 8+

Spring Framework

Hibernate/JPA

RESTful API design

RabbitMQ

Distributed systems

System integration

JEE

Oracle SQL

English (B2)

Tools

Maven

Git

GitLab CI/CD

Jenkins

Nexus

Jira

WildFly/JBoss

Job description

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.