Back-end developer- Java/Kotlin

Confidential

Brussels, Brussels, Belgium permanent

Posted: January 30, 2026

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Quick Summary

A Back-end developer with expertise in Java and Kotlin is required to design and develop scalable and secure server-side applications, integrating front-end and back-end components, and ensuring optimal performance and scalability.

Required Skills

Java Kotlin Spring Boot Microservices Architecture API Development MongoDB PostgreSQL Docker Kubernetes OpenID Connect OAuth2 Security Testing

Job Description

Job Tasks:

• Development of back-end website applications.

• Integration of user-facing elements developed by a front-end developer with server side logic.

• Implement core business logic.

• Creation of servers and databases for functionality.

• Design and implementation of data storage solutions.

• Understanding and implementation of security and data protection.

• Optimization of the application for maximum speed and scalability.

• Design and develop APIs.

• Participating in the design and creation of scalable software.

• Taking lead on projects, as needed.

• Maintenance of code integrity and organisation.

• Writing clean, functional code on the back-end.

• Compile and analyse data, processes, and codes to troubleshoot problems and identify areas for improvement.

• Testing and fixing bugs or other coding issues.

• Meet both technical and consumer needs.

• Write technical documentation.

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