Senior Systems Engineer (DOORS Next)

ALTEN is a global engineering and technology consultancy operating across over 35 countries worldwide. We partner with industry leaders across sectors including Aeronautics, Aerospace, Defence, Naval, Automotive, Energy, Rail, IT and many more to deliver innovative engineering solutions that drive technological advancement & support sustainable transformation.

Our teams of passionate and agile engineers work on cutting-edge projects that shape the future of technology and sustainability. At ALTEN, we empower talented engineers to innovate, solve complex challenges, and deliver impactful solutions that build tomorrow’s world—today.

Join us and start building tomorrow’s world today!

We are seeking a Senior Requirements Systems Engineer to support a major defence programme, playing a key role in the management, development, and governance of system requirements. You will work closely with multidisciplinary engineering teams and stakeholders, ensuring requirements are effectively captured, maintained, and managed throughout the engineering lifecycle.

This position is ideally suited to an experienced Systems Engineer with strong DOORS Next expertise who can provide guidance, best practice, and support for requirements management activities within a complex engineering environment.

Location: Portsmouth
On-site Requirement: Hybrid (3 days onsite)
Seniority: Senior
Security Clearance: Candidates must be willing and eligible to obtain SC clearance.

Key Responsibilities & Experience

• Lead and support requirements management activities across the programme using DOORS Next.
• Act as a subject matter expert for DOORS Next, providing guidance, support, and best practices to engineering teams and stakeholders.
• Develop, maintain, review, and manage system requirements throughout the engineering lifecycle.
• Collaborate with multidisciplinary engineering teams to ensure requirements are correctly defined, traced, and verified.
• Engage with internal and external stakeholders to support requirements capture, change management, and governance processes.
• Demonstrable experience operating within Defence, Aerospace, Naval, or other highly regulated engineering environments.

Required Skills

• Strong experience in Systems Engineering.
• Excellent knowledge and practical experience of DOORS Next.
• Proven background in Requirements Engineering and Requirements Management.
• Experience developing, reviewing, and maintaining requirements specifications.
• Understanding of requirements traceability, verification, and validation activities.
• Strong stakeholder management and communication skills.

Soft Skills & Collaboration

• Ability to influence and support engineering teams across multiple disciplines.
• Strong communication and relationship-building skills.
• Organised and methodical approach to requirements management.
• Proactive problem-solving mindset.
• Ability to work effectively within complex, stakeholder-rich environments.

Required Qualifications

• Bachelor’s or Master’s degree in Engineering, or relevant technical military background with equivalent experience.

Desirable Skills

• Experience within the Defence or Naval sector.
• Knowledge of systems engineering lifecycles and engineering governance processes.
• Experience working on complex, safety-critical, or mission-critical programmes.
• Familiarity with requirements verification and validation activities.
• Existing Security Clearance.

Why join us? 

We bring together entrepreneurial, tech-driven people to deliver innovative solutions for leading companies.

At ALTEN, you’ll work on exciting projects, supported by ongoing learning, mentoring, and clear career development tailored to your goals.

Join a passionate team and help build tomorrow, today.

In short you get: 

• A personalised career path and a rewarding management style 
• A huge diversity of engineering projects and industries
• Private Medical Insurance
• Cycle & Tech Scheme 
• Employee assistance programme
• Life insurance & Pension Scheme
• Social atmosphere, regular gatherings & team buildings
• Flexible way of working (role dependent)

We are proud to support the Armed Forces Covenant & actively encourage applications from members of the Armed Forces community, including veterans, reservists, service leavers, and military spouses/partners. We recognise the value of military skills and experience and are committed to ensuring that no applicant is unfairly disadvantaged during our recruitment and selection processes. 

ALTEN is committed to fostering a diverse and inclusive workplace and values the strength that comes from a global mix of backgrounds and perspectives. We welcome applications from all suitably qualified candidates, regardless of background or protected characteristics under the Equality Act 2010. If you require any reasonable adjustments during the recruitment process, please let us know. 

This role may require you to have or be willing to go through Security Clearance. As part of the onboarding process candidates will be asked to complete a Baseline Personnel Security Standard; details of the evidence required to apply may be found on the government website (url removed). If you are unable to meet this and any associated criteria, then your employment may be delayed, or rejected . Details of this will be discussed with you at interview.