Senior / Principal Engineering Design Substantiation Engineer

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.

• Authoring mainly mechanical, nuclear substantiation documentation, Design Substantiation Reports (DSR) which provide the assurance and evidence to support approval of the facilities Safety Case.