Senior Software Engineer

Expleo is seeking Software Engineers to join our growing Belfast team, delivering high-integrity engineering solutions across a range of complex and safety-critical domains. This role is ideally suited to candidates with experience in safety-critical or defence environments, though we also welcome strong software engineers from non-safety-critical backgrounds who are motivated to transition into this space through structured training and mentorship.

As a Software Engineer at Expleo, you will work on the design, development, testing, and integration of software systems used in regulated and high-assurance environments. You will contribute to the delivery of robust, secure, and reliable software solutions, often within defence, aerospace, or other safety-critical industries.

While prior safety-critical experience is highly desirable, we provide comprehensive training and support for engineers looking to develop expertise in standards-driven development environments.

• Design, implement, and test high-quality software solutions in line with project and regulatory requirements
• Work within structured development processes (e.g. requirements traceability, verification & validation)
• Collaborate with systems engineers, test engineers, and stakeholders across multidisciplinary teams
• Contribute to software design documentation and technical specifications
• Participate in code reviews and support continuous improvement of engineering practices
• Ensure compliance with relevant safety, security, and quality standards where applicable
• Support integration and validation activities in lab or simulated environments

• Candidates without direct safety-critical experience are encouraged to apply. Expleo provides:
  
  • Structured onboarding into safety-critical engineering practices
  • Training in relevant industry standards and compliance processes
  • Mentorship from experienced engineers within regulated domains
  • Opportunities to work on progressively complex and high-assurance systems

• Strong understanding of software engineering principles and lifecycle development
• Good problem-solving skills and attention to detail
• Ability to work effectively within a team and communicate technical concepts clearly

• Background in safety-critical, defence, aerospace, automotive, rail, or other regulated industries
• Familiarity with standards such as DO-178C, ISO 26262, IEC 61508, or similar
• Knowledge of embedded systems or real-time software development

• Background in safety-critical, defence, aerospace, automotive, rail, or other regulated industries
• Familiarity with standards such as DO-178C, ISO 26262, IEC 61508, or similar
• Experience with requirements management and traceability tools
• Knowledge of embedded systems or real-time software development
• Experience with configuration management tools (e.g. Git, SVN)
• Experience with requirements management and traceability tools
• Experience in software development using languages such as C, C++, Java, or similar
• Experience working in structured development environments (Agile, V-Model, or similar)

• Collaborative working environment – we stand shoulder to shoulder with our clients and our peers through good times and challenges  
• We empower all passionate technology loving professionals by allowing them to expand their skills and take part in inspiring projects   
• Expleo Academy - enables you to acquire and develop the right skills by delivering a suite of accredited training courses  
• Competitive company benefits such as medical and dental insurance, pension, life assurance, employee wellbeing programme, sports and social events, birthday hampers and much more!   
• Always working as one team, our people are not afraid to think big and challenge the status quo 

• As a Disability Confident Committed Employer we have committed to:
  • Ensure our recruitment process is inclusive and accessible
  • Communicating and promoting vacancies
  • Offering an interview to disabled people who meet the minimum criteria for the job
  • Anticipating and providing reasonable adjustments as required
  • Supporting any existing employee who acquires a disability or long term health condition, enabling them to stay in work at least one activity that will make a difference for disabled people
    

“We are an equal opportunities employer and welcome applications from all suitably qualified persons regardless of their race, sex, disability, religion/belief, sexual orientation or age”. 

We treat everyone fairly and equitably across the organisation, including providing any additional support and adjustments needed for everyone to thrive