Java Backend Developer

Uni Systems

Brussels, Brussels, Belgium Hybrid permanent

Posted: March 2, 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 Java Backend Developer to join our UniQue team in Brussels.

What will you be doing in this role?

• Development of back-end services.
• Design and develop REST APIs.
• Close collaboration with mobile app developers to extend mobile application functionality.
• Close collaboration with other backend teams on service integration.
• Implement core business logic.
• Troubleshooting problems and identifying areas for improvement.
• Writing unit and integration tests.
• Understanding and implementation of security and data protection.
• Writing clean and functional code.

Requirements:
What will you be bringing to the team?

• Bachelor's & 8 years of experience OR Master's & 4 years of experience in IT (the experience cannot overlap with studies).
• At least 2 years of experience with the following technologies:
• Java 17+, Spring Boot 3+
• REST services, RESTful APIs design and development
• API security standards (OAuth2)
• Git for source code management
• SQL and NoSQL databases, such as Oracle and Redis
• Containerization, such as Docker
• Microservices architecture

• The following technologies are considered an advantage but not required:
• Experience with Java Script such as Node.js, React, React Native, and/or Type Script

• Familiarity with Apache Kafka concepts

• Knowledge of CI/CD tools

• Proficiency in English language at a C1 level.

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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