{"id":2359603,"url":"https://alion.io/job/assystem-principal-mechanical-engineer-11","title":"Principal Mechanical Engineer","company":{"id":5278,"name":"Assystem","domain":"assystem.com","url":"https://alion.io/company/assystem","size_band":"5000+","is_staffing_agency":false,"employer_type":"services","is_intermediary":false,"listed_via":null,"ats_vendor":"SmartRecruiters","truth_index":{"grade":"B","score":75,"open_postings":200,"ghost_share":0,"stale_share":0.995,"repost_share":0,"time_to_fill_p50_days":27,"computed_at":"2026-10-12T06:55:09Z"}},"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":["Newcastle upon Tyne, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":56000,"max_usd":94000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":85},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[],"status":"live","first_seen_at":"2026-06-10T15:07:01Z","employer_posted_date":"2026-06-10","last_verified_at":"2026-10-12T15:33:37Z","board_verified":true,"closed_at":null,"days_open":124,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":124},"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.\nAssystem mobilizes 8,000 experts in 13 countries and intervenes across the entire project lifecycle, in engineering, project management and digital solutions.\n Join the Fusion and Modular Nuclear Business Unit! Reporting to the FEED Engineering Manager you will be responsible for Delivering Front Engineering activities for Small Modular Reactors, Advanced Modular Reactors and Fusion projects. The Principal Engineer shall work closely with multi-disciplined teams and will deliver scope through leadership of an engineering design team.\nYour mission:\nSpearheading the delivery of cutting-edge power station systems! \nTaking charge of optioneering studies to pinpoint the ultimate solution that perfectly aligns with client objectives. \nLeading a dynamic team in crafting and refining essential design documents, from Process Flow Diagrams to Equipment Datasheets, ensuring precision and excellence at every step.\nDirecting the development of Design Description Documents and Requirement Specifications, driving innovation and efficiency in every design aspect.\nSeamlessly integrating developed systems into the broader plant infrastructure for optimal performance and functionality. \nServing as the technical guru for designated scopes, guaranteeing top-notch expertise and oversight. \nChairing exhilarating Design Reviews and leading HAZID/HAZOP studies with diverse, multidisciplinary teams to ensure safety and excellence in every project facet.\nEnforcing strict adherence to company statutory H&S Policies and regulations, while ensuring unwavering compliance with project and Quality Management System standards.\nWhy Join the Community of Switchers?\n Over 55 years in nuclear engineering.\n Ranked among the top 3 largest nuclear engineering companies.\n Attractive social benefits, including an engaging Employee Committee and holiday bonuses.\n Ongoing training with numerous career opportunities.\n 70% of our managers are promoted internally!\n Hybrid work: 1-2 days remote per week\n Strong previous experience in highly regulated industries like nuclear, thermal power generation, or oil and gas. \nExpertise in thermal power systems and equipment, from steam turbines to pumps, with a keen understanding of nuclear power plant operations.\nProficiency in optioneering and conducting studies to evaluate viable options, backed by a track record of crafting compelling ALARP and BAT arguments. \nExperience in mentoring and developing junior staff, along with a proven history of leadership in managing small teams. \nExceptional communication skills for seamless interaction with internal and external stakeholders. \nFamiliarity with ASME, European, and UK codes and standards, coupled with a deep understanding of Product Safety Legislation. \nAppreciation for requirements management and systems engineering principles. \nResults-oriented with the ability to work both independently and collaboratively, coupled with strong organizational skills. \nBritish National with eligibility for obtaining and maintaining full UK security clearance.\n Due to the nature of the work, applicants must meet UK security clearance criteria.\nReady to make a difference in the nuclear engineering world? Join us and be a part of the future of nuclear and fusion innovation!\nNOTICE 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.\nWe 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.","description_format":"text","description_chars":4310,"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":[{"language":"English","level":"All levels","optional":false}]},"benefits":["Hybrid work"],"hiring_locations":[{"name":"United Kingdom","iso":"GB","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Nuclear Energy","Nuclear Engineering","Engineering Services"],"lifecycle":[{"event":"open","at":"2026-10-12T15:33:37Z"}],"visa":[],"liveness":{"score":11,"band":"cold","label":"Long shot","p_open":1,"p_active":0.392,"p_room":0.28,"age_days":124,"expected_fill_days":27,"reasons":["conf:3","win:tail","crowd:brand"],"computed_at":"2026-10-12T19:23:45Z"},"pay":null,"html_url":"https://alion.io/job/assystem-principal-mechanical-engineer-11","json_url":"https://alion.io/job/assystem-principal-mechanical-engineer-11.json","meta":{"generated_at":"2026-10-12T19:23:45Z","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":31441,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-13T00:00:00Z"}},"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":5278},"rest":"https://alion.io/mcp/rest/get_company?id=5278"},"human":"https://alion.io/catalog?offer=company.slices&for=job%2Fassystem-principal-mechanical-engineer-11"},{"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%2Fassystem-principal-mechanical-engineer-11"},{"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%2Fassystem-principal-mechanical-engineer-11"},{"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/assystem-principal-mechanical-engineer-11\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fassystem-principal-mechanical-engineer-11"}]}