C++ Software Engineer

Join ALTEN UKs growing Defence Software Engineering team as we expand our presence in Northern Ireland. Youll contribute to mission-critical software used across advanced aerospace and defence systems working with collaborative groups of engineers who take pride in precision performance and reliability. This is a chance to be part of a new engineering hub in Belfast delivering cutting-edge capabilities to some of the UKs most respected defence programmes.

Location: Belfast
On-site requirement: 35 days per week
Clearance: Active SC Clearance preferred / must be eligible (5 years UK residency)
Seniority: 5 years experience

Key Responsibilities:

• Design develop and maintain C software components for real-time safety-critical systems in the defence domain.
• Implement robust solutions on Linux-based platforms integrating with complex hardware and embedded environments.
• Collaborate closely with Systems and Test Engineers to refine requirements and deliver reliable maintainable software.
• Apply modern software development practices including code reviews unit testing CI/CD pipelines and static analysis.
• Optimise and profile software for multithreaded and performance-critical applications.
• Contribute to a culture of engineering excellence through code quality defensive programming and continuous improvement.

Qualifications :

Required Skills:

• Proficiency in Modern C (C11/14/17 or later) including templates STL and concurrency.
• Strong understanding of Linux development build tools (CMake Make) and CI environments (Jenkins GitLab CI etc.).
• Experience with real-time embedded or multithreaded systems.
• Proven ability to debug profile and optimise complex software systems.
• Excellent communication and collaboration skills across multi-disciplinary teams.

Desirable Skills:

• Familiarity with Defence or Aerospace software standards (e.g. DO-178C MISRA C ISO 26262).
• Experience with model-based design tools or requirements management systems (e.g. DOORS).
• Exposure to networking sensor processing or mission system software.
• Exposure to Linux OS scripting and CI/CD toolchains

Required Qualifications:

• Must be eligible for or already hold UK Security Clearance (SC)
• A Bachelors degree in Computer Science Software Engineering Electronics or a related field OR
• A relevant background in UK Armed Forces with proven embedded software experience

Additional Information :

Why join us 

We foster a community of dually talented individuals who are both entrepreneurs and technology specialists. Our teams embody the spirit of innovation and entrepreneurship enabling us to develop solutions most efficiently. 

Our commitment to sustainable growth is unwavering and we continuously strive for accelerated transformation and continuous improvement. Through ALTEN labs mentoring programs internal universities and more we are always pushing boundaries and embracing new possibilities. 

We offer incredible opportunities to join inspiring projects in the most innovative companies. 

We prioritise your career development with personalised support plans tailored to your own aspirations. Were here to empower you and help you reach your full potential. 

Join our passionate team and start building tomorrow today! 

In short you get: 

• A personalised career path and a rewarding management style 
• A chance to work on the most exciting engineering projects and technologies along with Premium Customers
• A huge diversity of engineering projects and industries
• A competitive salary
• Private Medical Insurance
• Pension Scheme
• Cycle-to-work Scheme among many additional benefits
• Social atmosphere regular gatherings and team buildings
• Flexible way of working (role dependent)

Remote Work :

No

Employment Type :

Full-time