Principal Systems Engineer

Assystem is an international company with one mission: accelerate the energy transition around the world.



Every day, our 7,750 switchers located in 12 countries (Europe, Middle East, Pacific Asia & Africa) connect their six thousand billion neurons to tackle the task of the century: switching to low-carbon energy.



We are a collective committed to the actors who are making the energy switch. Sharing our knowledge, expertise and values allows us to innovate and think differently about the energy transition.



Drawing on more than 55 years' experience in highly regulated sectors subject to strict security and safety requirements, we provide our customers with engineering and project management services, as well as digital services and solutions to optimize the performance of complex infrastructure projects throughout their life cycle. The Group is currently ranked second in the world for nuclear engineering.



To ensure a viable, efficient, and reliable energy future for all.

🔧 Principal Systems Engineer

Join a leading-edge team shaping the future of the UK’s nuclear industry. We're looking for a Principal Systems Engineer with the vision, experience, and technical leadership to deliver complex, safety-critical engineering solutions.

🌟 What You’ll Do:

🔬 Apply innovative techniques to develop high-quality, future-ready engineering solutions.

🧠 Demonstrate deep expertise across all major engineering disciplines.

📈 Lead the development of processes and procedures that drive continuous improvement and operational efficiency.

🤝 Lead multi-disciplinary teams in delivering high-complexity engineering projects.

📘 Bring proven experience delivering solutions to recognised standards, regulations, or bespoke customer specifications—preferably within highly regulated sectors.

🎓 Be on track to achieve Chartered Engineer (C.Eng.) status or hold it already. INCOSE ESEP (or equivalent) highly desirable.

🔧 Take technical ownership of systems engineering outputs across major projects.

🛡️ Monitor and provide strategic advice on emerging health and safety concerns.

🎯 Contribute to the definition of technical goals across the business.

📚 Interpret and evaluate evolving standards, regulations, and directives, embedding this knowledge into business practices.

🛠️ Assess and introduce emerging software tools to enhance delivery and innovation.

🔍 Lead investigations into quality issues, implementing corrective actions to drive improvement.

📢 Prepare and deliver technical presentations to clients, regulators, or external stakeholders.

📑 Define policy, methods, and toolsets for:

• Business, mission, and stakeholder needs
  
  

• System requirements and architecture
  
  

• System design definition and interfaces
  
  

• System analysis and model-based analysis
  
  

• Verification and validation of system designs
  
  

👥 Provide strong technical leadership across multi-discipline teams.

🧭 Operate with full autonomy, requiring no formal technical supervision beyond peer review.

📊 Lead technical estimating for medium- to high-complexity projects.

🔗 Manage interfaces with external project teams, ensuring alignment and quality across all stakeholders.

🎤 Present technical content at industry events or client briefings; support business development through relationship-building.

📂 Contribute to the development and enhancement of the Integrated Management System (IMS).

✅ Help define standards compliance guidelines across projects and teams.

✅ Demonstrates substantial experience in delivering engineering solutions in compliance with recognised industry standards, customer-specific codes, or legislative requirements. At least half of this experience should be within highly regulated industries or complex engineering projects.

🎓 Ideally holds, or is actively working toward, Chartered Engineer (C.Eng.) status or equivalent professional accreditation.

🌐 INCOSE ESEP (or equivalent systems engineering certification) is highly desirable.

Due to the nature of work to be undertaken applicants will be required to meet certain residency criteria in order to attain a minimum level of UK security clearance if not already security cleared to a minimum SC level.

We are committed to equal treatment of candidates and promote, as well as foster all forms of diversity within our company. We believe that bringing together people with different backgrounds and perspectives is essential for creating innovative and impactful solutions. Skills, talent, and our people’s ability to dare are the only things that matter !. Bring your unique contributions and help us shape the future.