Senior Full Stack Java Developer

Application Deadline: 24 June 2026
Location: Brussels Belgium (Hybrid minimum 2 days on-site)
Start Date: 29 June 2026
Contract Duration: Until 15 July 2027
Sector: Public Sector Environmental & Spatial Planning

About the Role

We are seeking an experienced Senior Full Stack Java Developer to join a multidisciplinary development team within a public sector organisation focused on environmental and spatial planning.

In this role you will act as a technical expert and key point of contact for the development team contributing to both the design and implementation of complex web applications. You will work across the full stack supporting backend and frontend development while also ensuring high-quality software delivery aligned with domain-specific requirements such as regulatory systems enforcement tools and geographic information systems (GIS).

This position requires a strong engineering mindset combining technical expertise with the ability to translate business needs into scalable software solutions.

Key Responsibilities

• Design develop and maintain full stack Java-based web applications.
• Act as technical lead and point of contact within the development team.
• Translate business requirements into technical designs and implementation solutions.
• Build and maintain RESTful services and backend systems using Java and Spring.
• Develop frontend components using JavaScript and web technologies.
• Ensure code quality through testing debugging and peer review.
• Work on both new application development and maintenance of existing systems.
• Collaborate within a multidisciplinary Agile team environment.
• Support integration of Geographic Information Systems (GIS) into applications.
• Contribute to architectural decisions and technical improvements.
• Participate in Agile ceremonies and development planning.

Required Skills & Experience

Essential Requirements

• Minimum 5 years of experience in Java application development.
• Strong experience with JavaScript development.
• Extensive experience with Spring Framework.
• Knowledge of JPA / Hibernate.
• Strong understanding of Maven build tools.
• Experience designing and consuming REST APIs.
• Experience in web component-based development.
• Formal education or equivalent experience in Java/J2EE development.
• Fluent Dutch (CEFR C2 level) is mandatory.

Preferred Skills

• Experience leading or mentoring development teams.
• Strong ability to code test and debug efficiently.
• Experience working in Agile development environments with leadership responsibilities.
• Knowledge of software testing methodologies.
• Experience with and npm.

Nice to Have

• Experience in the public sector.
• Experience working with GIS or geospatial applications.
• Familiarity with long-term maintenance of enterprise applications.

Soft Skills

• Strong engineering mindset with problem-solving ability.
• Ability to translate business needs into technical solutions.
• Leadership and mentoring capabilities.
• Strong collaboration skills in multidisciplinary teams.
• Proactive structured and quality-driven approach.
• Ability to work independently and take technical ownership.

Work Environment

• Hybrid working model with at least 2 days per week on-site in Brussels.
• Collaborative Agile team structure.
• Focus on long-term development and maintenance of critical public systems.
• Strong emphasis on environmental and societal impact.

What Youll Do

• Build and maintain critical applications supporting environmental and spatial policy.
• Contribute to GIS-enabled digital solutions.
• Lead technical development efforts within your team.
• Ensure robust scalable and maintainable software delivery.

Apply before 24 June 2026.