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.
Job Description
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.
Qualifications
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.
Additional Information
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.