Senior Systems Engineer

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  • ASSYSTEM
  • Warrington, Warrington
  • Full-Time
  • 4 days ago
Published
May 18, 2026
Location
Warrington, United Kingdom
Job Type

Senior Systems Engineer: our view in 3 lines...

  • The Role: A senior systems engineer role for candidates with systems engineering experience in highly regulated industries such as nuclear, aerospace, or defence.
  • The Person: Produce and manage requirement specifications, define system architecture and interfaces, model system functions and interfaces, and work with mechanical, electrical and process systems.
  • Requirements: Experience operating Rationale DOORS software, familiarity with Model Based Systems Engineering, systems thinking, systems engineering processes, and awareness of relevant BS or INCOSE standards.

Job Description

Company Description

Today, Assystem is among the top three independent nuclear engineering firms worldwide. With over 60 years of experience in highly regulated sectors, the group supports public and industrial stakeholders in the execution of complex and strategic infrastructure projects, subject to high safety and security requirements. 

Assystem mobilizes 8,000 experts in 13 countries and intervenes across the entire project lifecycle, in engineering, project management and digital solutions.

Job Description

Are you a Senior Systems Engineer with experience working with mechanical, electrical, and process systems in a highly regulated industry (Nuclear, Aerospace, Defence, etc.)? Assystem’s Decommissioning Strategic Business Unit is expanding and we are looking for skilled Systems Engineers for our Defence packages of work.

Your missions:

🎯 Requirement specification production / management

🎯 Interface Management

🎯 System Architecture definition

🎯 System Functional and Interface modelling

🎯 Working with mechanical, electrical and process systems

🎯 Operating requirements management database software (DOORS preferential)

🎯 Operating Model Based Systems engineering Software (Capella preferential)

Qualifications

Qualifications/Skills to be successful:

💡 Experience in complex regulated industry essential (i.e. Nuclear, Aerospace, etc.)

💡 Experience in Nuclear industry desirable.

💡 Foundation background in Mechanical or Electrical Engineering is acceptable.

💡 Degree in engineering or STEM subject is mandatory or be able to demonstrate equivalent experience.

💡 Systems thinking and systems engineering processes is mandatory.

💡 Systems engineering training/qualifications desirable.

💡 Willing to accept a candidate with SE experience and a desire to move into this field if they can demonstrate competence.

💡 Experience operating Rationale DOORS software as a practitioner is desirable.

💡 Familiarity with Model Based Systems Engineering is desirable.

💡 Awareness of relevant BS or INCOSE standards desirable

Additional Information

Whilst we encourage applications from all nationalities, Assystem within the UK are subject to security and export control restrictions due to the nature of work to be undertaken.  

These restrictions mean that factors including your nationality, any previous nationalities you have held, and/or your place of birth may limit those roles that you can perform for the organisation. 

NOTICE TO CANDIDATES ON RECRUITMENT FRAUD - We are committed to safeguarding candidates from fraudulent activity associated with our recruitment process. Please note that we will never offer specialist CV writing services, request payment or ask for sensitive personal information during the recruitment process.

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.

  • ASSYSTEM Job: Engineering / Technical
  • Type of contract ASSYSTEM: Permanent
  • ASSYSTEM Sector: Nuclear
  • Key Skills
    ? Key Skills in dark blue have been inferred based on similar industry roles
    Systems Engineering Requirements Management Interface Management System Architecture Model-based Systems Engineering Rational DOORS Capella INCOSE Standards Project Management

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