Principal Systems Engineer

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.

Your role

• 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, ArchiMate, 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 lifecycles, 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, ArchiMate, TOGAF, and MODAF.
• Comprehensive knowledge of engineering lifecycles, including their selection, tailoring, and implementation.
• A detailed 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.
• Deep 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.

Wherever you are in your career - and whoever you are - AtkinsRéalis is for you. Here, support and collaboration are a vibrant part of a culture that lets you choose where - and how far - your career can go. Take on projects that push boundaries and drive sustainable impact, surrounded by colleagues who believe there's no limit to how brilliant you can be. It's time to join a like-minded team where you'll be rewarded, supported, and free to be your kind of brilliant. Rewards & benefits 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. About AtkinsRéalis 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.