Principal Systems Engineer

Overview

Empowering projects in a complex world.

You might know us for the great work we do across our wide variety of projects. We're proud to say it's thanks to our people's diversity of thought, expertise and knowledge. And when you join us, you'll be a part of this genuinely collaborative environment, where everyone's voice is valued and treated equally. We're passionate about what we do, but we don't take ourselves too seriously.

Simply put, this a great place to be. So, when it comes to your life outside of work, ask us about our flexible and remote working policies designed to help you get the most out of life. Additionally, if you've taken time away from your career and are ready to return, we offer a range of supportive opportunities designed to help you confidently step back into the workplace and continue your professional journey.

Are you ready to take on a role where your work truly matters? As a Principal Systems Engineer in our Advanced Engineering Delivery & Consultancy (AEDC) practice, you'll be at the heart of programmes that protect the UK and secure its future. These are complex, high-profile projects that demand creativity, precision, and collaboration – and they need people who thrive on challenge.

As part of this role, you'll get the chance to collaborate with world-class clients on programmes delivered in some of the country's most secure and strategically important locations — including Aldermaston, Barrow‑in‑Furness, Faslane and Devonport.

In this role, you won't be confined to one task. You'll experience genuine variety, moving from early concept development to integration and delivery, working across land, sea, air, and Critical National Infrastructure (CNI) domains. You'll lead technical teams, guide decision-making, and ensure that every component fits seamlessly into the bigger picture. Model-Based Systems Engineering (MBSE) will underpin your work, supporting our design, analysis, and verification activities through its contemporary digital methods.

You’ll work closely with stakeholders at every level, from engineers to senior leaders, influencing outcomes and shaping solutions that make a real difference. And because these programmes are critical to national security, you'll know that your contribution has impact far beyond the office.

• Lead and tailor the application of systems engineering processes (e.g. ISO 15288) across the full engineering lifecycle, providing direction and assurance to project teams.
• Apply and guide the use of MBSE approaches and tools (e.g. Sparx EA, Cameo), confidently using modelling languages and architectural frameworks such as UML/SysML, Archi Mate, TOGAF and MODAF.
• Lead requirements engineering activities, ensuring robust traceability through to verification and validation and managing requirement maturity and change.
• Build and maintain a strong network in the organisation to support the growth of the practice.
• Use your expertise and experience to develop the team through coaching and mentoring.
• Select, tailor and implement appropriate engineering life cycles, balancing technical rigour with delivery pragmatism.
• Integrate complex systems across diverse military and civilian platforms (including submarines, aircraft, ships, vehicles, and advanced power and energy systems), addressing system‑of‑systems challenges.
• Lead technical work packages or small teams, operating within a range of development and delivery methodologies.
• Apply a working knowledge of the MOD acquisition framework, using Knowledge in Defence (KiD) to inform decision‑making and stakeholder engagement.
• Build and maintain trusted relationships with clients and stakeholders, clearly communicating complex technical issues to non‑engineers and senior decision‑makers.

• Degree qualified (Level 6 or above) in a relevant STEM subject or possess equivalent depth of experience in an engineering field.
• Professional recognition with an appropriate institution, such as CEng or CSEP.
• Experience in selecting and using MBSE approaches and tools (e.g., Sparx EA, Cameo).
• Knowledge of modelling languages and architecture frameworks, including UML/SysML, Archi Mate, TOGAF, and MODAF.
• Co…