Senior Full Stack Java Developer | Data Platforms & Defense Software | Diegem, Belgium

Design and build applications that connect data platforms with operational systems where reliability, security and performance support decision making.

At ILIAS Solutions, you join the Data Platform team within the Defense Capability Management unit. You work on software that supports logistics, maintenance and operational workflows in environments where systems must perform consistently.

You operate as a senior engineer within a team that builds and evolves applications used in real operational contexts. Your work shapes how data is processed, exposed and used across systems.

Meaningful Work in a Mission Driven Environment

Your work supports systems that enable operational readiness. You build applications that ensure data is accessible, consistent and usable for decision making across complex environments.

Complex Challenges, Clear Solutions

You work in environments where multiple systems, data sources and users interact. Applications integrate with data platforms, process large volumes of information and remain stable under continuous use.

You design solutions that balance performance, scalability and maintainability, while working with evolving requirements and diverse technologies.

The Impact You Help Create

You build applications that connect data with users and systems. Your work ensures that information flows reliably and supports consistent execution in operational environments.

You design and develop full stack applications that support data driven systems and integrate with complex data platforms.

• Design and build backend services using Java and Spring Boot
• Develop RESTful APIs that expose data and system functionality
• Work with relational and NoSQL databases including PostgreSQL, Oracle and SQL Server
• Integrate with object storage solutions such as S3 compatible systems (e.g. MinIO)
• Build and maintain frontend components using HTML, CSS, JavaScript and server side technologies such as JSP or Thymeleaf
• Contribute to data processing workflows using tools such as Apache Spark
• Ensure application quality through testing frameworks such as JUnit
• Manage build and deployment using tools such as Maven and Docker
• Take ownership of solutions from design to deployment
• Collaborate with data engineers and platform teams to integrate applications with data platforms

Support Core Defense Capabilities

• Fleet Management through applications exposing aircraft and maintenance data
• Expeditionary Operations through system integration and reliable data access
• Total Asset Visibility through user interfaces connected to data platforms
• MRO and Sustainment through applications supporting maintenance and logistics processes

What You Bring

• 5+ years of experience in software development
• Strong experience with Java and Spring Boot
• Solid experience with SQL and relational databases
• Experience with NoSQL or distributed data systems is a plus
• Experience with RESTful API design and backend architecture
• Experience with frontend technologies such as HTML, CSS and JavaScript
• Experience with JSP or Thymeleaf is a plus
• Experience with React is a plus
• Familiarity with Apache Spark or similar data processing frameworks
• Experience with Git, Maven and container technologies such as Docker
• Experience with testing frameworks such as JUnit
• Strong understanding of software design, architecture and lifecycle
• Ability to take ownership and work independently within a team

Systems Thinking and Analytical Strength

You understand how applications, data platforms and infrastructure connect. You design solutions that ensure consistency, scalability and long term maintainability across systems.

Working Across Teams and Functions

You work with data engineers, platform teams and stakeholders. You align backend, frontend and data solutions to ensure that applications work reliably in practice.

Grow Through Capability and Innovation

You deepen your expertise in full stack development within data driven environments. You work on systems that combine backend services, data processing and user interfaces.

Grow in a Mission Driven Environment

At ILIAS Solutions, you contribute to applications that support logistics, maintenance and operational decision making.

Build capability over time

At ILIAS, learning is embedded in the way we work.
Development takes place through daily exposure to complex systems, supported by a structured and modern Learning Management System. Clear development paths provide insight into current capability and possible next steps.

From onboarding to more advanced levels, learning remains practical and directly linked to the work. We invest in time, tools and guidance to support consistent development.

As capability grows, so does the impact you can make within the organization.

Contribute to What Comes Next

You help shape how applications interact with data platforms and how users access critical information. Your work supports long term system capability and performance.

Contact

Ready to build applications that connect data platforms with real operational systems

Apply directly or contact youness.kaissi@ilias-solutions.com