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[5818] Back End Developer

[5818] Back End Developer

Hybrid

Brussels, Belgium

Senior

Freelance

26-02-2026

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Skills

Java Kotlin Jira MongoDB PostgreSQL Docker Kubernetes Security Testing Architecture Databases Confluence Spring Hibernate Spring Boot Maven Microservices

Job Specifications

Contract: Freelance

Start date: ASAP

Duration: 400 days – Initial contract 100 days

Location: Brussels, Belgium (2-3 days on-site)

Requirements:

Bachelor’s Degree in IT or a related field
At least 17 years of experience in IT
At least one year of expertise in back end: Vert.x, Kotlin , Java (> 17) , Spring Boot (WebFlux), Hibernate.
At least one year of expertise in Architecture & Integration: Microservices Architecture, API-driven Development, AS4.
At least one year of expertise in Database: MongoDB , PostgreSQL, Virtuoso Triple Store, OpenSearch
At least one year of expertise in Containerization & Orchestration: Docker, Kubernetes
At least one year of expertise in Security: OpenID Connect, OAuth2, TLS, Keycloak
At least one year of expertise in Security Testing & Dependency Management: SAST, DAST, Fortify, SonarQube, Sonatype, Dependency-Track, Maven
At least one year of expertise in Collaboration & Productivity Tools: JIRA, Confluence, Office 365, SharePoint

Duties:

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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About the Company

Empowering enterprises to thrive through...expert staffing, strategic consultancy & innovative solutions. • Consulting - International provider of IT & Cyber staffing in sensitive environments • Space - Pioneers of "Cyber in Space" making orbital objects resilient Know more