{"id":1965039,"url":"https://alion.io/job/assystem-seniorprincipal-plant-layout-engineer","title":"Senior/Principal Plant Layout 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":209,"ghost_share":0,"stale_share":0.995,"repost_share":0,"time_to_fill_p50_days":28,"computed_at":"2026-10-17T05:46:00Z"}},"role":"Hardware","role_family":"Hardware","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":["Warrington, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":65000,"max_usd":116000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":22},"experience_years_min":null,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[],"status":"live","first_seen_at":"2026-10-06T15:18:46Z","employer_posted_date":"2026-10-06","last_verified_at":"2026-10-17T23:33:48Z","board_verified":true,"closed_at":null,"days_open":11,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":11},"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 Layout Engineering Manager, the Principal Layout Integration Engineer will provide technical leadership across Fusion and Modular Nuclear programmes.\nThe Principal Layout Integration Engineer will act as a recognised subject matter expert for plant layout integration, piping layout, building integration, modularisation and multidisciplinary coordination. The role will support project delivery, capability growth, business development and development of engineering best practice.\nWhilst providing technical leadership and strategic direction, the Principal Layout Integration Engineer will remain actively involved in project delivery, supporting development of complex layouts, technical studies and resolution of challenging engineering issues.\nKey Responsibilities\nLead plant layout development from concept through detailed design for complex facilities and plant areas.\nAct as technical lead for major buildings, systems or programme-level integration activities.\nLead development of equipment, piping, cable tray, access and maintenance arrangements.\nLead piping routing studies and layout optimisation activities.\nProvide technical leadership across multiple projects and programmes.\nLead requirements-driven layout development and multidisciplinary integration activities.\nDefine layout integration methodologies, standards and engineering approaches.\nLead major optioneering, constructability, modularisation and plant integration studies.\nLead complex multidisciplinary reviews and technical workshops.\nProvide technical assurance and review of layout deliverables.\nLead resolution of complex layout, routing, requirements and integration challenges.\nEnsure layout solutions satisfy operational, safety, constructability and lifecycle requirements.\nSupport bids, proposals and client engagement activities.\nDevelop layout standards, procedures and best practice guidance.\nMentor engineers and support capability development.\nSupport recruitment, succession planning and capability growth.\nAuthor and review technical reports, engineering strategies and client-facing documentation\nWhy Apply?\nJoin Assystem and become a key player in delivering critical nuclear projects that shape the future of energy. Embrace this opportunity to excel in a dynamic environment where your expertise and leadership will drive global innovation.\nBenefits include:\nPension scheme (8% company contribution / 4% personal contribution)\n25 days’ paid annual leave + bank holidays + option to buy or sell days \nProfessional fees reimbursed\nFlexible working\nEmployee referral scheme \n Essential Skills, Qualifications and Experience\nDegree qualified in Mechanical Engineering or related discipline, or equivalent industrial experience.\nExtensive experience in plant layout, piping layout, plant integration and multidisciplinary engineering delivery.\nExperience leading complex engineering studies and technical decision-making.\nStrong understanding of systems engineering principles, requirements management and interface management.\nStrong understanding of constructability, maintainability, modularisation and lifecycle considerations.\nExperience leading multidisciplinary teams, workshops and design reviews.\nExperience supporting major design reviews, technical governance activities and engineering assurance processes.\nExperience using E3D, PDMS, Plant 3D, Siemens NX, Revit, Inventor and Navisworks, or equivalent platforms.\nExcellent report writing, presentation and stakeholder management skills.\nProven ability to influence senior stakeholders, clients and project teams.\nAbility to define engineering strategy whilst remaining engaged in technical delivery.\nSC Clearance or capable of achieving it.\nDesirable Skills and Experience\nExperience within the nuclear, fusion, SMR or AMR sectors.\nExperience supporting business development and client-facing activities.\nExperience developing engineering standards, methodologies and governance processes.\nCandidates able to demonstrate experience through technical leadership, engineering decision-making and delivery of complex engineering projects are encouraged to apply.\n 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.\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":5812,"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":["Annual leave","Flexible schedule"],"hiring_locations":[{"name":"United Kingdom","iso":"GB","kind":"country"}],"hiring_excludes":[],"relocation_offered":false,"industries":["Energy & Utilities"],"lifecycle":[{"event":"open","at":"2026-10-06T17:03:37Z"}],"visa":[],"liveness":{"score":58,"band":"ok","label":"Likely open","p_open":1,"p_active":0.647,"p_room":0.9,"age_days":10,"expected_fill_days":28,"reasons":["conf:1","stale_co","wave","velocity","win:mid","comp:brand"],"computed_at":"2026-10-17T05:46:00Z"},"pay":null,"html_url":"https://alion.io/job/assystem-seniorprincipal-plant-layout-engineer","json_url":"https://alion.io/job/assystem-seniorprincipal-plant-layout-engineer.json","meta":{"generated_at":"2026-10-18T00:11:30Z","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":308,"day_limit":null,"remaining_today":null,"minute_limit":300,"resets_at":"2026-10-19T00:00:00Z"}},"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-seniorprincipal-plant-layout-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%2Fassystem-seniorprincipal-plant-layout-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%2Fassystem-seniorprincipal-plant-layout-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/assystem-seniorprincipal-plant-layout-engineer\", \"note\": \"what you need it for\"}"},"human":"https://alion.io/catalog?offer=company.verify&for=job%2Fassystem-seniorprincipal-plant-layout-engineer"}]}