Senior Software Engineer (Java) – Contract

Denmark (3 days onsite)
12-month contract (starting July)
Hourly rate (competitive)
Defence Client

The Opportunity

We’re supporting a leading defence client in Denmark looking for a Senior Software Engineer to join a critical programme focused on multi-domain and command-and-control systems.

This is a mission-critical environment, where you’ll build highly reliable, high-performance software used in complex operational scenarios. The team is driving modernisation across architecture and DevOps while maintaining extremely high standards of robustness and precision.

What You’ll Be Doing

• Develop and maintain Java-based applications for defence and command-and-control systems
• Build complex desktop user interfaces using Swing
• Design and implement scalable backend services with a focus on performance and reliability
• Take ownership of key components from design through to deployment and ongoing evolution
• Contribute to system architecture and technical direction
• Work within safety-critical, high-reliability environments
• Collaborate with cross-functional teams across product, systems engineering, and infrastructure
• Support the adoption of modern DevOps practices:
  • Kubernetes & containerisation
  • GitOps & infrastructure-as-code
  • CI/CD pipelines
• Drive quality through:
  • Automated testing
  • Observability
  • Continuous delivery
• Mentor engineers through code reviews, design discussions, and technical guidance

What We’re Looking For

• 5+ years’ experience in backend software engineering (Java ecosystem)
• Strong experience building modular, scalable, and maintainable systems
• Hands-on experience with Swing (or similar desktop UI frameworks)
• Experience with:
  • Containerised environments
  • CI/CD pipelines
  • Kubernetes (ideally production environments)
• Solid understanding of software architecture and system design
• Experience working in complex, multidisciplinary engineering environments
• Background in defence, aerospace, automotive, or other safety-critical industries is highly beneficial
• Strong engineering mindset focused on simplicity, clarity, and long-term sustainability

Additional Info

• Fluent English required (spoken & written)
• Danish is a plus, not essential
• Must be able to work onsite in Denmark 3 days per week