{"id":3129904,"url":"https://alion.io/job/amentum-senior-principal-engineering-design-substantiation-engineer","title":"Senior / Principal Engineering Design Substantiation Engineer","company":{"id":14861,"name":"Amentum","domain":"amentum.com","url":"https://alion.io/company/amentum","size_band":"5000+","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Workday","truth_index":{"grade":"B","score":80,"open_postings":103,"ghost_share":0,"stale_share":0.99,"repost_share":0,"time_to_fill_p50_days":17,"computed_at":"2026-10-27T05:46:45Z"}},"role":"Industrial Engineering","role_family":"Industrial Engineering","seniority":"lead","employment_type":"full_time","work_mode":"hybrid","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["Arlington, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":63000,"max_usd":105000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":109},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[],"status":"closed","first_seen_at":"2026-09-15T00:00:00Z","employer_posted_date":"2026-09-15","last_verified_at":"2026-10-27T04:59:05Z","board_verified":false,"closed_at":"2026-10-27T04:59:05Z","days_open":42,"trust":{"level":"not_scored","repost_count":null,"flags":[],"days_open":42},"description":"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.\nHere, 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.\nWe’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.\nWork-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.\nAbout the Opportunity\nAmentum 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.\nHybrid work is available, but may require visits to Chorley, Wolverhampton, Aldermaston and Twyford, with the main location being either Chorley or Aldermaston.\nAbout the Opportunity\nAmentum 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.\nKey Responsibilities\nAuthoring mainly mechanical, nuclear substantiation documentation, Design Substantiation Reports (DSR) which provide the assurance and evidence to support approval of the facilities Safety Case.\n\nInterrogating the Engineering Schedule and evidencing claims, Specific Safety Functional Requirements (SSFR), made against Systems, Structures, and Components (SSC) in the documentation.\n\nReviewing 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.\n\nLiaising with both internal and external designers and equipment vendors to gather information.\n\nInterfacing with other stakeholders such as Human Factors, Fire Safety, Criticality, Radiological and the client Technical Authority.\n\nHere's What You'll Need\nQuestioning attitude, confident to challenge information where needed.\n\nAbility to guide both internal and external designers to the level and standard required to achieve substantiation of an SSFR.\n\nSeveral years’ experience in design substantiation and safety case involvement for highly regulated industries, including the authoring of DSRs (or equivalent).\n\nGood oral and written communication skills, including presentation and report writing.\n\nDegree with honours in a related subject (or equilvalent)\n\nChartered Engineer Status or equivalent (or working towards).\n\nOur Culture\nOur 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.\nWe 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.\nWhen we embrace different perspectives and work together, we become more innovative, more agile, and more successful.\nWe 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.\nIf 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 ","description_format":"text","description_chars":4563,"description_truncated":false,"requirements":{"experience_years_min":null,"management_years_min":null,"team_size_min":null,"manages_managers":false,"education":null,"security_clearance":false,"languages":[]},"benefits":["Flexible schedule","Hybrid work"],"hiring_locations":[{"name":"United Kingdom","iso":"GB","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Military Logistics","Business Process Outsourcing (BPO)","Engineering Services"],"lifecycle":[{"event":"open","at":"2026-10-23T03:21:28Z"},{"event":"close","at":"2026-10-27T04:59:05Z"}],"visa":[{"country":"GB","licensed_sponsor":true,"evidence":"Licensed UK visa sponsor (Skilled Worker, Senior or Specialist Worker)","filings_12m":null,"filings_prev_12m":null,"green_card_filings_12m":null,"median_offered_wage_usd":null,"route":"Skilled Worker; Global Business Mobility: Senior or Specialist Worker","cap_exempt":false,"checked_at":"2026-10-27T06:21:15+00:00","sources":["UK Home Office: register of licensed sponsors (workers)"],"filings_for_role_12m":0}],"liveness":null,"pay":null,"html_url":"https://alion.io/job/amentum-senior-principal-engineering-design-substantiation-engineer","json_url":"https://alion.io/job/amentum-senior-principal-engineering-design-substantiation-engineer.json","meta":{"generated_at":"2026-10-27T19:54:40Z","cache_seconds":300,"methodology":"https://alion.io/methodology","terms":"https://alion.io/terms","contact":"https://alion.io/contact","api":"https://alion.io/developers","about":"Alion is a live layer of people, companies and AI agents: who they are, whether they are real and active right now, what they do and how to work with them, readable by people and by agents and paid per call.","catalog":"https://alion.io/catalog.json","usage":{"tier":"crawler_verified","counted_by":"address","units_charged":1,"used_today":10772,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-28T00:00:00Z"}},"offers":[{"id":"company.slices","title":"One company in depth, by slice","status":"live","price":{"credits":0.02,"usd":0.002,"plus_per_slice":{"credits":0.05,"usd":0.005}},"unit":"per company, plus each slice with data","note":"the employer in depth","call":{"mcp_tool":"get_company","arguments":{"id":14861},"rest":"https://alion.io/mcp/rest/get_company?id=14861"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Famentum-senior-principal-engineering-design-substantiation-engineer"},{"id":"market.stats","title":"A market slice: pay, demand and time to fill","status":"live","price":{"credits":1,"usd":0.1},"unit":"per slice","note":"pay, demand and time to fill for this role and place","call":{"mcp_tool":"market_stats"},"human":"https://alion.io/catalog?offer=market.stats&for=job%2Famentum-senior-principal-engineering-design-substantiation-engineer"},{"id":"job.search","title":"Open jobs by role, technology, place, pay and visa","status":"live","price":{"credits":0.02,"usd":0.002},"unit":"per posting in a list","note":"similar open postings","call":{"mcp_tool":"search_jobs"},"human":"https://alion.io/catalog?offer=job.search&for=job%2Famentum-senior-principal-engineering-design-substantiation-engineer"},{"id":"company.verify","title":"Is this company real and active right now","status":"pilot","price":null,"unit":"per company","request":{"url":"https://alion.io/catalog/request","method":"POST","body":"{\"offer\": \"company.verify\", \"for\": \"job/amentum-senior-principal-engineering-design-substantiation-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Famentum-senior-principal-engineering-design-substantiation-engineer"}]}