{"id":3464358,"url":"https://alion.io/job/alten-principal-mechanical-engineer-ptls","title":"Principal Mechanical Engineer - PTLS","company":{"id":52934,"name":"ALTEN","domain":"alten.com","url":"https://alion.io/company/alten-com","size_band":"5000+","is_staffing_agency":false,"employer_type":"staffing","is_intermediary":false,"listed_via":null,"ats_vendor":"SmartRecruiters","truth_index":{"grade":"B","score":76,"open_postings":88,"ghost_share":0,"stale_share":0.977,"repost_share":0,"time_to_fill_p50_days":27,"computed_at":"2026-11-03T05:54:40Z"}},"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":["Bristol, United Kingdom"],"countries":["GB"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":59000,"max_usd":97000,"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":"live","first_seen_at":"2026-10-29T11:41:28Z","employer_posted_date":"2026-10-29","last_verified_at":"2026-11-03T05:36:28Z","board_verified":true,"closed_at":null,"days_open":4,"trust":{"level":"ok","repost_count":null,"flags":[],"days_open":4},"description":"ALTEN is a global engineering and technology consultancy operating across over 35 countries worldwide. We partner with industry leaders across sectors including Aeronautics, Aerospace, Defence, Naval, Automotive, Energy, Rail, IT and many more to deliver innovative engineering solutions that drive technological advancement & support sustainable transformation.\nOur teams of passionate and agile engineers work on cutting-edge projects that shape the future of technology and sustainability. At ALTEN, we empower talented engineers to innovate, solve complex challenges, and deliver impactful solutions that build tomorrow’s world-today.\nJoin us and start building tomorrow’s world today!\n Join ALTEN and play a key role in the delivery of major nuclear new-build programmes that will help shape the future of low-carbon energy generation. You will provide technical leadership across Pools, Tanks, Liners and Sumps (PTLS) systems, supporting complex engineering challenges from design through to manufacturing and construction. Working within a multidisciplinary engineering environment, you'll contribute to the successful replication and optimisation of critical infrastructure across large-scale nuclear projects while ensuring the highest standards of safety, quality, and technical excellence.\nLocation: Bristol\nOn-site Requirement: 3 days on-site\nSeniority: Mid-Level\nSecurity Clearance: Candidates must be willing and eligible to obtain BPSS clearance.\nKey Responsibilities\nProvide technical oversight and engineering leadership across assigned PTLS scope areas.\nReview and approve contractor technical deliverables to ensure compliance with project requirements and applicable standards.\nSupport tender evaluations and supplier assessments from a technical perspective.\nResolve technical issues arising during manufacturing, installation, and construction activities.\nParticipate in inspections, design reviews, technical meetings, and engineering governance activities.\nPromote lessons learned and support replication strategies across major nuclear infrastructure programmes.\n We are seeking Mechanical Engineers with experience in nuclear or highly regulated industries who can provide technical oversight across complex infrastructure projects. The ideal candidate will have strong experience in design review, manufacturing support, construction interfaces, and stakeholder engagement within multidisciplinary engineering environments.\nRequired Skills\nProven experience working with Pools, Tanks, Liners and Sumps (PTLS) systems.\nStrong knowledge of nuclear civil structures and embedded metallic components.\nExperience with fabrication, welding, and installation methodologies.\nUnderstanding of nuclear quality assurance processes and regulatory requirements.\nExperience supporting design integration and construction sequencing activities.\nSoft Skills & Collaboration\nStrong communication skills with the ability to engage effectively with contractors, suppliers, and project stakeholders.\nAbility to collaborate within multidisciplinary engineering and construction teams.\nStrong problem-solving skills with a proactive approach to technical issue resolution.\nAbility to manage priorities and deliver high-quality engineering output within programme timescales.\nRequired Qualifications\nBachelor's or Master's degree in Engineering, or relevant technical military background with equivalent experience.\nDesirable Skills\nExperience working on nuclear projects.\nDemonstrated capability in design review, manufacturing oversight, and construction support.\nFamiliarity with RCC-M, RCC-CW, Eurocodes, and applicable UK nuclear requirements.\nExperience supporting large-scale infrastructure or nuclear new-build programmes.\n Why join us?\nWe bring together entrepreneurial, tech-driven people to deliver innovative solutions for leading companies.\nAt ALTEN, you’ll work on exciting projects, supported by ongoing learning, mentoring, and clear career development tailored to your goals.\nJoin a passionate team and help build tomorrow, today.\nIn short you get:\nA personalised career path and a rewarding management style \nA huge diversity of engineering projects and industries\nPrivate Medical Insurance\nCycle & Tech Scheme \nEmployee assistance programme\nLife insurance & Pension Scheme\nSocial atmosphere, regular gatherings & team buildings\nFlexible way of working (role dependent)\nWe are proud to support the Armed Forces Covenant & actively encourage applications from members of the Armed Forces community, including veterans, reservists, service leavers, and military spouses/partners. We recognise the value of military skills and experience and are committed to ensuring that no applicant is unfairly disadvantaged during our recruitment and selection processes. \nALTEN is committed to fostering a diverse and inclusive workplace and values the strength that comes from a global mix of backgrounds and perspectives. We welcome applications from all suitably qualified candidates, regardless of background or protected characteristics under the Equality Act 2010. If you require any reasonable adjustments during the recruitment process, please let us know. \nThis role may require you to have or be willing to go through Security Clearance. As part of the onboarding process candidates will be asked to complete a Baseline Personnel Security Standard; details of the evidence required to apply may be found on the government website Gov.UK. If you are unable to meet this and any associated criteria, then your employment may be delayed, or rejected . 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