Mechanical Engineering Tech - Contractor

Mid-Senior Level | Full-time Business Operations | Livermore, CA | 08/06/2026Reference #: REF8674NJob Code: TSS.3 Technical Services & Ops MTS 3 / TSS.4 Technical Services & Ops MTS 4Organization: Project Management OfficePosition Type: Career IndefiniteSecurity Clearance: Anticipated DOE Q clearance (requires U.S. citizenship and a federal background investigation)Drug Test: Required for external applicant(s) selected for this position (includes testing for use of marijuana)Medical Exam: Not applicable

Lawrence Livermore National Laboratory (LLNL) has turned bold ideas into world-changing impact advancing science and technology to strengthen U.S. security and promote global stability. Our mission spans four critical national security areas nuclear deterrence, threat preparedness, energy security, and multi-domain defense empowering teams to take on the toughest challenges of today and tomorrow. With a culture built on innovation and operational excellence, LLNL is a place where your expertise can make a real impact.Job DescriptionWe have an opening for a Mechanical Engineer. You will provide engineering design solutions for the Laboratory’s mechanical infrastructure, building HVAC systems, building automation and DDC control systems, energy management, laboratory design, and central plant-type equipment in support of projects associated with new construction, remodeling, and modifications to conventional office and laboratory facilities. This position is in the Project Management Office (PMO).The Project Management Office (PMO) provides LLNL with engineering, design, estimating, construction, and project management services. PMO provides infrastructure services to enable cutting-edge research and development in the areas of defense technologies, global security, laser science, bioscience, and more. PMO offers cradle to grave infrastructure services to achieve reliable delivery of completed projects with priority on safety, collaboration, and a workforce working toward our shared vision.This position may offer a hybrid schedule, which includes the flexibility to work from home one or more days per week, after a probationary period. The specifics of the hybrid schedule, including the exact number of days required in the office and virtual work options may vary based on the needs of the team and the organization. You willPerform independent technical tasks associated with the engineering, planning, design, and construction of projects associated with LLNL’s mechanical infrastructure.Perform computer-based analyses of heating and cooling load calculations, energy management, and life-cycle cost.Prepare mechanical construction documents, including scoping criteria, construction drawings, specifications, procurement specifications, duct and pipe sizing, HVAC load calculations, and AutoCAD drawings.Provide engineering support during construction by reviewing submittals and shop drawings, responding to contractor questions, evaluating change-order requests, resolving field issues, observing construction activities, and performing inspections. Provide engineering analysis and solutions to a diverse range of moderately complex site building mechanical systems issues and/or problems.Develop approaches to solve moderately complex technical issues associated with specific projects using independent judgment and analysis.Represent the organization in providing engineering solutions to a diverse range of moderate to complex facility mechanical technical issues and/or problems associated with specific projects.Provide engineering support during construction by reviewing submittals and shop drawings, responding to contractor questions, evaluating change order requests, resolving field problems, and performing inspections.Lead assigned internal mechanical projects and serve as the mechanical lead for in-house design projects, with responsibility for technical criteria, budgets, schedules, deliverables, coordination of designers and drafters, and preparation of AutoCAD and Revit models and drawings. Act as the mechanical lead for in-house design projects, and independently provide mechanical designs for said projects, utilizing Revit and AutoCAD.4 levelDesign complex building and laboratory mechanical systems for new construction and the renovation and remodeling of existing facilities, including the design of heating, ventilation and air conditioning systems.Prepare designs and engineering studies for conventional mechanical equipment and components in complex building environments supporting highly advanced research activities. Projects include: Design for the installation of air handling equipment, fume hoods, boilers, chillers, DDC control systems, pumps and filter systems, as well as complex mechanical systems in specialized research facilities such as clean rooms, high performance computing facilities, bio-safety labs, semiconductor and electronics fabrication labs, non-reactor nuclear facilities, and laser research facilities.Prepare construction documents for designs, including construction drawings, construction specifications, and procurement specifications for the pre-purchase of LLNL furnished equipment. Use independent judgement to ensure construction documents that have been prepared by both internal staff and external A/E firms are in conformance with applicable Building Codes and LLNL Standards.Prepare procurement documents for the subcontracting of outside consultant Architectural/Engineering (A/E) services to supplement internal engineering capability; manage/direct the outside A/E contracts, including preparing project scopes, technical criteria, engineering design estimates and schedules.DOE Q-level security clearance which requires U.Bachelor’s degree in mechanical engineering, or an equivalent combination of education and at least ten years of mechanical engineering design experience in an architectural/engineering consulting firm.Professional registration as a Mechanical Engineer in the state of California or reciprocity from another state or ability to obtain a California license within 24 months.Experience and knowledge of the professional practice of facility mechanical engineering and construction in areas such as HVAC systems design, piping system analysis and pump selection, building automation and control systems, with a focus on the mechanical design for laboratory tenant improvement (TI) work.Experience in working on projects with multiple stakeholders and complex requirements. Experience in plumbing design, and the design of industrial gas systems, and process piping systems for tenant improvement type work.Experience in the preparation of scoping documents for fire protection systems, and in preparing simple fire protection designs for small tenant improvement projects.Experience with mechanical engineering design software for building modeling such as heat load and psychometric analysis, HVAC system modeling, energy management, and/or pipe flow analysis, experience with Microsoft Office software, and Revit and AutoCAD for the preparation of working drawings.4 LevelSignificant experience and advanced knowledge of the professional practice of commercial, industrial, and laboratory facility mechanical engineering and construction in areas such as HVAC systems design, piping system analysis and pump selection, building automation and control systems, and LEED/sustainable design.Advanced knowledge of applicable state and national construction codes and standards, including California Mechanical & Plumbing Codes, NFPA 1, NFPA 13, and other Fire Codes and Standards, AWWA Standards, and ASHRAE Standards such as 62.1 and 90.1.Significant experience in design management, including project planning, scheduling, professional services estimates, and adherence to completion dates.4) AnnuallyThis is the lowest to highest salary range in good faith we would pay for this role at the time of this posting. An employee’s position within the salary range will be based on several factors including, but not limited to, specific competencies, relevant education, qualifications, certifications, experience, skills, seniority, geographic location, performance, and business or organizational needs.Additional Information#LI-HybridPosition InformationThis is a Career Indefinite position, open to Lab employees and external candidates.Why Lawrence Livermore National Laboratory?Flexible Benefits Package401(k)Relocation AssistanceEducation Reimbursement ProgramFlexible schedules (*depending on project needs)Our values - visit Security ClearanceThis position requires a Department of Energy (DOE) Q-level clearance. Also, all L or Q cleared employees are subject to random drug testing. This includes testing for use of marijuana as Federal Law applies to us as a Federal Contractor.Wireless and Medical DevicesPer the Department of Energy (DOE), Lawrence Livermore National Laboratory must meet certain restrictions with the use and/or possession of mobile devices in Limited Areas. Depending on your job duties, you may be required to work in a Limited Area where you are not permitted to have a personal and/or laboratory mobile device in your possession. This includes, but not limited to cell phones, tablets, fitness devices, wireless headphones, and other Bluetooth/wireless enabled devices. If you use a medical device, which pairs with a mobile device, you must still follow the rules concerning the mobile device in individual sections within Limited Areas. Sensitive Compartmented Information Facilities require separate approval. How to identify fake job advertisementsPlease be aware of recruitment scams where people or entities are misusing the name of Lawrence Livermore National Laboratory (LLNL) to post fake job advertisements. LLNL never extends an offer without a personal interview and will never charge a fee for joining our company. All current job openings are displayed on the Career Page under “Find Your Job” of our website. All qualified applicants will receive consideration for employment without regard to race, color, religion, marital status, national origin, ancestry, sex, sexual orientation, gender identity, disability, medical condition, pregnancy, protected veteran status, age, citizenship, or any other characteristic protected by applicable laws.Reasonable AccommodationOur goal is to create an accessible and inclusive experience for all candidates applying and interviewing at the Laboratory. If you need a reasonable accommodation during the application or the recruiting process, please use our online form to submit a request. California Privacy NoticeThe California Consumer Privacy Act (CCPA) grants privacy rights to all California residents. The law also entitles job applicants, employees, and non-employee workers to be notified of what personal information LLNL collects and for what purpose. Videos To Watch