Senior / Principal Engineering Design Substantiation Engineer
Confirmed on the employer's own hiring board on Oct 25, 2026. First seen by Alion on Sep 15, 2026. Amentum scores B on the Alion truth index.
At Amentum, we're not just solving problems; we're engineering the future. Our team is driven by an unyielding commitment to innovation, integrity, and collaboration, tackling some of the most significant challenges in science, security, and sustainability. If you're passionate about making a real impact and want to be part of a community that values ethical excellence, this is the place where your ambition can thrive.
Here, we believe that success comes from continuously pushing boundaries and working together to deliver on our promises. We embrace challenges with confidence and are dedicated to creating a secure and vibrant future for all.
We’ll inspire and empower you to deliver your best work so you can evolve, grow and succeed - today and into tomorrow. We offer an exciting range of opportunities to develop your career within a supportive team who always strive to do the right thing for our people, clients and communities.
Work-life balance and flexibility is a key focus area for us. We’re happy to discuss hybrid, part-time and flexible working hours, patterns and locations to suit you and our business.
About the Opportunity
Amentum are recruiting a Senior / Principal Engineering Design Substantiation Engineer (EDS) to author Substantiation Reports which will underpin the design of the various process systems. You will work with cross-discipline teams, ensure safety case alignment, and liaise with suppliers and stakeholders. Candidates should possess substantial design engineering experience and familiarity with safety case methodologies and documentation.
Hybrid work is available, but may require visits to Chorley, Wolverhampton, Aldermaston and Twyford, with the main location being either Chorley or Aldermaston.
About the Opportunity
Amentum is currently producing the design of the Process Plant and Equipment (PP&E) to deliver an enduring manufacturing capability for a key customer in the defence industry.
Key Responsibilities
Authoring mainly mechanical, nuclear substantiation documentation, Design Substantiation Reports (DSR) which provide the assurance and evidence to support approval of the facilities Safety Case.
Interrogating the Engineering Schedule and evidencing claims, Specific Safety Functional Requirements (SSFR), made against Systems, Structures, and Components (SSC) in the documentation.
Reviewing Safety Case and suppliers’ documentation and identifying potential shortfalls in the design or substantive evidence that will either prevent an SSFR being substantiated or require significant investment to provide the required substantiation.
Liaising with both internal and external designers and equipment vendors to gather information.
Interfacing with other stakeholders such as Human Factors, Fire Safety, Criticality, Radiological and the client Technical Authority.
Here's What You'll Need
Questioning attitude, confident to challenge information where needed.
Ability to guide both internal and external designers to the level and standard required to achieve substantiation of an SSFR.
Several years’ experience in design substantiation and safety case involvement for highly regulated industries, including the authoring of DSRs (or equivalent).
Good oral and written communication skills, including presentation and report writing.
Degree with honours in a related subject (or equilvalent)
Chartered Engineer Status or equivalent (or working towards).
Our Culture
Our values are built on a strong foundation of safety, integrity, and respect for every individual. People are at the heart of our mission, and we believe in supporting one another through a culture of care and collaboration.
We strive to create a workplace where everyone feels they belong and can thrive. Supporting mental wellbeing and fostering a sense of connection are essential to how we work.
When we embrace different perspectives and work together, we become more innovative, more agile, and more successful.
We partner with VERCIDA, for greater online accessibility please visit www.vercida.com to view and access our roles. As a Disability Confident employer, we will interview all disabled applicants who meet the minimum criteria for a vacancy. We welcome applications from candidates who are seeking flexible working and from those who may not meet all the listed requirements for a role.
If you require further support or reasonable adjustments with regards to the recruitment process (for example, you require the application form in a different format), please contact [email protected]