Software Design Engineer (DO178C)

This role is based full-time on-site, working directly alongside customer engineering and assurance teams throughout programme execution. 

• Develop and maintain Low-Level Requirements (LLRs) from existing architecture, design models and software implementation.
• Analyse source code, design artefacts and system models to derive accurate design-level requirements.
• Ensure alignment between HLRs, LLRs, architecture and implementation.
• Establish and maintain design traceability within the programme requirements management environment.
• Support architectural design updates for in-scope functionality including ARINC and CAN capabilities.
• Identify design inconsistencies, omissions and compliance gaps.
• Work with Requirements Engineers to ensure requirement decomposition is complete and auditable.
• Support formal design reviews and independent assurance activities.
• Produce design rationale and supporting review evidence.
• Support implementation reviews against derived design intent.
• Provide technical support to verification and certification teams.
• Contribute to compliance matrices, design metrics and certification evidence production.
• Support issue resolution arising from verification, static analysis and review activities.

• Degree qualified in Software Engineering, Electronic Engineering, Computer Science, Systems Engineering or related discipline.
• Embedded software or real-time systems engineering background preferred.
• Exposure to safety-critical software development standards is desirable.

• Embedded software design and software architecture principles.
• Creation and maintenance of Low-Level Requirements (LLRs).
• Experience translating software implementation into structured design artefacts.
• Strong requirements decomposition and traceability skills.
• Understanding of design-to-code and code-to-design relationships.
• Experience reviewing embedded software implementations.
• Strong analytical problem-solving capabilities.
• Ability to understand and interpret complex software architectures.
• Experience supporting formal technical review processes.
• Excellent written communication and technical documentation skills.

• DO-178C software lifecycle knowledge.
• Experience deriving LLRs to support DAL A or DAL B compliance activities.
• STM32 microcontroller experience.
• Ada, C and/or C++ development experience.
• SysML and Cameo Systems Modeler experience.
• Knowledge of driver, BSP and platform software architectures.
• Experience within aerospace, defence or other safety-critical industries.
• Familiarity with Polarion, BitBucket and software configuration management processes.
• Understanding of verification, structural coverage and certification evidence generation.

• Experience developing or reconstructing software design artefacts for embedded systems.
• Experience supporting safety-critical or regulated software development programmes.
• Demonstrable experience establishing traceability between requirements, design and implementation.
• Experience reviewing and interpreting existing software baselines.
• Experience participating in formal design reviews and compliance assessments.
• Experience working within multidisciplinary engineering and assurance teams.

• This role requires significant on-site working due to access requirements for customer repositories, development environments, design tools and stakeholder engagement activities.

• 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
• 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