Senior Full Stack Java Developer

Senior Full Stack Java Developer

ILIAS Solutions

Diegem, Belgium

Opportunity

Join ILIAS Solutions and contribute to making mission-critical products for the defense industry. We are seeking an experienced Senior Full Stack Java Developer to join our Data Platform team within the Defense Capability Management unit.

In this role, you will work autonomously to design secure, reliable, and scalable applications that support vital operations. If you are a strong communicator ready to apply your skills in Java and Spring Boot to high-stakes challenges, we want to meet you.

Your mission

Key Responsibilities:

• Design, develop, and maintain full-stack applications using Java and Spring Boot;
• Write clean, maintainable, and well-tested code;
• Work with relational databases (PostgreSQL, Oracle DB, SQL Server) to design schemas, write queries, and ensure data integrity;
• Integrate and manage object storage systems (MinIO);
• Collaborate with data teams on Apache Spark and Python based integrations;
• Participate in code reviews, technical discussions, and architectural decisions;
• Ensure applications are secure, reliable, and scalable;
• Contribute to team knowledge sharing;
• Troubleshoot and resolve complex technical issues across the full stack.

Your capabilities

Required Technical Skills:

Backend Development:

• Java – Advanced proficiency with modern Java;
• Spring Boot – Extensive experience building RESTful APIs;
• Database Management– Strong SQL skills with hands-on experience in:
  • PostgreSQL;
  • Oracle Database;
  • SQL Server.
• Object Storage – Experience with MinIO or similar S3-compatible storage solutions.

Frontend Development:

• Solid foundation in HTML, CSS, JavaScript, JSP, and Thymeleaf;
• React experience is a plus;
• Data Processing & Analytics;
• Experience with distributed data processing using Apache Spark;
• Python experience is a plus.

Additional Technical Requirements:

• RESTful API design and implementation;
• Version control systems (Git);
• Build tools (Maven);
• Container technologies (Docker preferred);
• Testing frameworks (JUnit, etc.).

Required Experience & Qualifications

• Bachelor’s degree in Computer Science, Software Engineering, or equivalent experience;
• 5+ years of professional software development experience;
• Proven experience with Java and Spring Boot;
• Proven experience working with multiple database systems;
• Experience with both SQL and NoSQL databases;
• Strong understanding of the software development lifecycle and agile methodologies.

Personal Attributes

• Independent Worker – Able to take ownership of projects and work with minimal supervision;
• Team Player – Collaborative mindset with excellent communication skills;
• Problem Solver – Strong analytical and troubleshooting capabilities;
• Adaptable – Comfortable working with diverse technologies and evolving requirements;
• Quality-Focused – Writes clean, maintainable, well-documented code;
• Continuous Learner – Passionate about staying current with technology trends and best practices.