Java Developer

Uni Systems

Brussels, Brussels, Belgium Remote permanent

Posted: April 2, 2026

Required Skills

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 Developer to join our UniQue team.

What will you be doing in this role?

• Design, develop, and maintain high-quality Java-based applications and services.
• Contribute to the implementation of microservices and distributed systems.
• Collaborate with architects and technical leads to implement defined architectures and technical solutions.
• Develop and maintain RESTful and/or SOAP APIs.
• Implement integrations with external systems using web services and messaging technologies.
• Participate in data analysis and contribute to data modelling activities.
• Write clean, maintainable, and efficient code following best practices and coding standards.
• Develop and execute unit and integration tests.
• Contribute to automated testing and CI/CD pipelines.
• Troubleshoot, debug, and optimize application performance.
• Participate in code reviews and provide constructive feedback.
• Support deployment, release management, and environment configuration.
• Participate in Agile ceremonies, technical discussions, and team meetings.
• Contribute to technical documentation and user support when needed.

Requirements:
What do you need to succeed in this position?

• Master’s degree in IT with minimum 9 years of professional experience (or Bachelor’s degree with minimum 13 years of experience).
• At least 5 years of experience as a java developer.
• Strong experience in Java (JEE / Spring ecosystem).
• Good knowledge of object-oriented design and common design patterns.
• Experience with RESTful APIs and/or SOAP web services.
• Good understanding of microservices architectures.
• Experience with message brokers and event-driven systems (Kafka, JMS).
• Solid knowledge of relational databases and SQL.
• Experience with integration technologies (Apache etc.) and web services.
• Good understanding of HTTP protocol and API design principles.
• Experience with automated testing frameworks (e.g., JUnit, Mockito).
• Familiarity with Docker and containerized environments
• Familiarity with CI/CD tools and pipelines
• Basic understanding of gRPC and Protobuf.
• Knowledge of web security principles (OAuth2, OpenID Connect).
• Nice to have certifications: Certified DevSecOps Professional (CDP) certification, AWS Certified Solutions Architect or Certified Kubernetes Application Developer (CKAD).
• Advanced English (C1) communication skills (written and spoken) and French skills (C1) will be considered an asset.

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 Diversity, Equality & Inclusion Policy for more information.

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