Open Source Developer (Java / GIS) - ASAP Start - Freelance / CDI

AlterSolutions

Antwerp, Flanders, Belgium permanent

Posted: April 9, 2026

Job Description

As an Open Source Developer, you will contribute to the design and development of innovative applications where mapping, geolocation and software engineering come together to deliver high value-added solutions.

You will work within a multidisciplinary team of analysts, architects and developers, and actively participate in the evolution of platforms and technical projects.

Notre bureau francophone est situé à Namur. Notre siège principal est situé à Edegem, mais nous proposons également des flexiplaces dans nos hubs à Gand et à Louvain.

• Develop high-performance, user-centric applications using Java, Spring Boot and modern JavaScript frameworks.
• Contribute to the design and continuous improvement of the software architecture.
• Ensure code quality and implement testing throughout the development lifecycle.
• Be involved end-to-end in technical projects: design, development, integration and optimisation.
• Analyse and solve complex technical challenges.
• Maintain an active technology watch in open source development, GIS and cloud technologies.

Technical Environment

• Back-end: Java, Spring Boot
• Front-end / GIS: OpenLayers, modern JavaScript frameworks (React, Vue.js or equivalent), HTML5, CSS3
• Databases: Relational and NoSQL databases, ORM frameworks (JPA, Hibernate)
• Cloud: AWS, Google Cloud Platform, Microsoft Azure
• Infrastructure: Linux, NGINX, HTTPD, Docker
• Architecture: Microservices, REST APIs

Profile Requirements

• Bachelor’s or Master’s degree in Computer Science.
• 3 to 5 years of relevant professional experience with the listed technologies.
• Strong command of Java and Spring Boot.
• Experience with at least one modern front-end framework (React, Vue.js, etc.).
• Strong interest in mapping and Geographic Information Systems (GIS).
• Enthusiasm, professionalism and strong team spirit.

Key Skills

• Java (5 years – Medior level)
• React or equivalent (3 years – Medior level)
• Geographic Information Systems (GIS)
• Open source environments
• Experience in the Utilities sector is an asset
• Fluency in French is required

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