Principal / Senior Systems Engineer

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 or Senior Systems Engineer in our 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 the application of systems engineering processes, such as ISO 15288:2023, across the full engineering lifecycle.
• Utilise MBSE approaches and tools (e.g. Sparx EA, Cameo) and apply modelling languages and architecture frameworks including UML/SysML, ArchiMate, TOGAF, and MODAF.
• Conduct requirements engineering and ensure clear linkage to verification and validation activities.
• Select, tailor, and implement appropriate engineering lifecycles for projects.
• Integrate complex systems across a range of platforms, such as military and civilian platforms (including submarines, aircraft, ships, and vehicles), as well as advanced power and energy systems.
• Manage projects and teams within various development methodologies.
• Demonstrate an understanding of the MOD’s acquisition framework and apply Knowledge in Defence (KiD) appropriately.
• Build trusted relationships using strong interpersonal skills and effectively communicate complex subjects to non-engineers and senior stakeholders.

• 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 using MBSE approaches and tools (e.g., Sparx EA, Cameo).
• Knowledge of modelling languages and architecture frameworks, including UML/SysML, ArchiMate, TOGAF, and MODAF.
• Comprehensive knowledge of engineering lifecycles, including their selection, tailoring, and implementation.
• An understanding of the wider aspects of delivery, such as commercial, finance and planning.
• Experience integrating complex systems, such as military and civilian platforms (submarines, aircraft, ships, vehicles), civilian aircraft systems, and advanced power and energy systems.
• Ability to apply systems engineering processes (e.g., ISO 15288:2023) across the lifecycle.
• Proven track record in managing projects and teams across various development methods.
• Understanding of engineering within the MOD’s acquisition framework and Knowledge in Defence (KiD).
• Strong interpersonal skills, with the ability to build trusted relationships.
• Ability to understand, simplify, and explain subject matter to non-engineers and senior stakeholders.

Explore the rewards and benefits that help you thrive – at every stage of your life and your career. Enjoy competitive salaries, employee rewards and a brilliant range of benefits you can tailor to suit your own health, wellbeing, financial and lifestyle choices. Make the most of a myriad of opportunities for training and professional development to grow your skills and expertise. And combine our hybrid working culture and flexible holiday allowances to balance a great job and fulfilling personal life.

Be rewarded. Find out more.

We're AtkinsRéalis, a world-class engineering services and nuclear organization. We connect people, data and technology to transform the world's infrastructure and energy systems. Together, with our industry partners and clients, and our global team of consultants, designers, engineers and project managers, we can change the world. We're committed to leading our clients across our various end markets to engineer a better future for our planet and its people.

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Security clearance

This role may require security clearance and offers of employment will be dependent on obtaining the relevant level of clearance. If this is necessary, it will be discussed with you at interview. The vetting process is delivered by United Kingdom Security Vetting (UKSV) and may require candidates to provide proof of residency in the UK of 5 years or longer. If applying to this role please do not make reference to (in conversation) or include in your application or CV, details of any current or previously held security clearance.

We are committed to creating a culture where everyone feels that they belong - a place where we can all be ourselves, thrive and develop to be the best we can be. So, we offer a range of family friendly, inclusive employment policies, flexible working arrangements and employee resource groups to support all employees. As an Equal Opportunities Employer, we value applications from all backgrounds, cultures and ability.

At AtkinsRéalis, we seek to hire individuals with diverse characteristics, backgrounds and perspectives. We strongly believe that world-class talent makes no distinctions based on gender, ethnic or national origin, sexual identity and orientation, age, religion or disability, but enriches itself through these differences.