Expleo
Senior Software Engineer
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Overview
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.
Responsibilities
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.
- 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
Qualifications
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
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Essential skills
- 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
- Bare Metal Programming
- Knowledge of embedded systems or real-time software development
- HW/SW interfacing
- Ability to hit the ground running
- 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
- 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)
- Experience in software development using languages C, C++
- Safety Experience working to develop SIL2 compliant systems
- Defence Experience
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Benefits
- 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
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