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Application Software Engineer | Defense

At Capgemini Engineering, the world leader in engineering services, we bring together a global team of engineers, scientists, and architects to help the world’s most innovative companies unleash their potential. From autonomous cars to life-saving robots, our digital and software technology experts think outside the box as they provide unique R&D and engineering services across all industries. Join us for a career full of opportunities. Where you can make a difference. Where no two days are the same.

Job Description

As an Application Software Engineer specializing in cryptography, you will be part of a dynamic team delivering sovereign cryptographic products and solutions. You will design, develop, and test secure software systems, ensuring the highest standards of security and compliance.

 

You will play a key role in:

 

  • Developing high-quality, secure, and efficient applications using Java programming language and Spring framework (Spring Boot, Spring Security) to create robust software components
  • Collaborating with cross-functional teams in an Agile Scrum environment to ensure timely delivery of features and enhancements
  • Performing rigorous testing and validation, including unit and integration tests, to verify software quality and security compliance
  • Creating and maintaining comprehensive documentation of software designs, specifications, and testing procedures for security accreditations
  • Troubleshooting complex software issues and providing technical support for deployed applications

Your Profile

  • Master's degree in Computer Science, Software Engineering, or a related field
  • Minimum 3 years of proven experience in application software development, with strong proficiency in Java (minimum 11 years of experience) and Spring framework
  • Experience with secure coding practices, encryption algorithms, and cryptographic protocols
  • Knowledge of DevSecOps practices and tools (e.g., Jenkins, Git, Kubernetes)
  • Strong problem-solving skills
  • Fluent in French and English

What You'll Love About Working Here

  • At Capgemini Belgium we offer flexibility in more than one way: next to our hybrid way of working, where we offer you can work 70% from home, we also offer our flex abroad program. With this program you can work up to 45 days abroad, this to maintain a good work-life balance.
  • Our mission is your career path. Our array of career growth programs and diverse professions are crafted to support you in exploring a world of opportunities.
  • OUTfront, Women@Capgemini or CapAbilityare 3 examples of employee led networks dedicated to advance diversity, equity and inclusion within workplace and society.

Capgemini is a global business and technology transformation partner, helping organizations to accelerate their dual transition to a digital and sustainable world, while creating tangible impact for enterprises and society. It is a responsible and diverse group of 340,000 team members in more than 50 countries. With its strong over 55-year heritage, Capgemini is trusted by its clients to unlock the value of technology to address the entire breadth of their business needs. It delivers end-to-end services and solutions leveraging strengths from strategy and design to engineering, all fueled by its market leading capabilities in AI, generative AI, cloud and data, combined with its deep industry expertise and partner ecosystem.
Ref. code:  418748
Posted on:  16 Feb 2026
Experience Level:  Experienced Professionals
Contract Type:  Permanent
Location: 

Diegem, BE

Brand:  Capgemini Engineering
Professional Community:  Software Engineering

Apply now »