Senior Full Stack Developer

ILIAS Solutions; Diegem; On-site; EUR 65,000 - 95,000; Full time

Job summary

ILIAS Solutions is seeking a senior software engineer to design and build full‑stack applications that connect data platforms with operational systems. You’ll join the Data Platform team within the Defense Capability Management unit and help deliver reliable, secure, and scalable software for logistics, maintenance and workflows.

Responsibilities include building backend services in Java/Spring Boot, exposing RESTful APIs, working with PostgreSQL/Oracle/SQL Server, and integrating with

Qualifications

• 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.

Responsibilities

• 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
• 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

Skills

Java

Spring Boot

REST API design

Frontend technologies: HTML, CSS, Java

GIT

Maven

Docker

JUnit

JSP/Thymeleaf

React

Apache Spark

NoSQL or distributed data systems

Tools

Maven

Docker

Git

Apache Spark

JSP

Thymeleaf

React

PostgreSQL

Oracle

SQL Server

MinIO

Job description

Opportunity

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.

Your Mission

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.
Your Mission
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

• 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.

Build Your Future with ILIAS

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.

Build Your Future with ILIAS

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