FullStack Java Developer

Uni Systems

Brussels, Brussels, Belgium Hybrid permanent

Posted: February 9, 2026

Job Description

At Uni Systems, we are working towards turning digital visions into reality. We are continuously growing and we are looking for a FullStack Java Developer to join our UniQue team in Brussels.

What will you be doing in this role?

• Development of front-end website.
• Development of back-end website.
• Design and develop APIs.
• Building reusable code for future use.
• Development and integration of technological components.
• Implementation of user requirements.
• Prototyping.
• Elaboration of test programs.
• Integration with other applications.
• Writing of technical documentation.
• Assistance with deployment and configuration of the system.
• Participation in meetings with the project teams

Requirements:
What will you be bringing to the team?

• Bachelor's degree & 17 years of experience OR Master's degree & 13 years of experience
• In depth knowledge of Java 8 - 11. (Java 17 and above is considered a plus)
• Expertise with Spring ecosystem: Spring Boot, Spring MVC, Spring Security, Validation, Hibernate/JPA.
• Strong experience developing RESTful and SOAP web services, including Spring Web Services.
• Experience with API management (Apigee).
• Solid experience with application servers: Tomcat, WebLogic.
• Familiarity with testing frameworks:
• Backend: Spring Boot Test, JUnit, Mockito
• Frontend: Karma, Jasmine, Mocha, Chai

• Competence with Angular 18+.
• Solid knowledge of HTML5, CSS3, and LESS preprocessor.
• Understanding of Continuous Integration / Continuous Development (CI/CD) practices.
• Proficiency with build and dependency management using Maven and Gradle.
• Source control using Git / Bitbucket.
• Messaging technologies such as JMS queues.
• Expertise with SOA, service buses, and message-oriented middleware.
• Strong knowledge of Relational Database Management Systems, especially Oracle v12+.
• Experience working with AWS.
• Knowledge of UML, including use case, state transition, and activity diagrams.
• Good understanding of Agile principles.
• The following technologies and skills are considered a plus:
• Atlassian Suite (JIRA, Confluence, Bitbucket, Bamboo)
• MySQL (versions 5+)
• Enterprise Service Bus technologies (Apache Camel, Apache ServiceMix, Oracle Service Bus…)
• Web accessibility standards (WCAG 2.0, WCAG 2.1, WAI-ARIA)
• UX design best practices (responsive and mobile-first design)
• DevSecOps
• Design principles (SOLID, IDEALS, CQRS, SAGA)
• Encryption & signing

• Proficiency in English language at C1 level.
• Proficiency in French language at B2 level is considered an advantage.

At Uni Systems, we are providing equal employment opportunities and banning any form of discrimination on grounds of gender, religion, race, color, nationality, disability, social class, political beliefs, age, marital status, sexual orientation or any other characteristics. Take a look at our for more information.

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