Senior Mechanical Engineer - Active Clearance Required

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We have multiple openings for Senior Mechanical Engineers to participate in new and ongoing projects. We provide nuclear weapon engineering design expertise; systems engineering; experimental device design; fabrication and assembly; surveillance of nuclear stockpile components; engineering analysis and computational simulation; and engineering testing for evaluation and maintenance of the enduring and future nuclear weapon stockpile. Our engineers interface with colleagues at other National Laboratories and Production Agencies, National Nuclear Security Administration (NNSA), and Department of Defense (DoD) and their contractors. These positions are in the Defense Technologies Engineering Division (DTED), within the Engineering Directorate. DTED provides support to Strategic Deterrence Programs. Depending on your assignment, this position may offer a hybrid schedule, blending in-person and virtual presence. You may have the flexibility to work from home one or more days per week. These positions will be filled at either level based on knowledge and related experience as assessed by the hiring team. Additional job responsibilities (outlined below) will be assigned if hired at the higher level. You will Provide technical expertise in mechanical and electromechanical design. Conduct research in structural, thermal, hydraulic, or dynamics modeling of mechanical systems. Produce advanced conceptual and detail designs in support of on-going projects. Prepare supporting health and safety documentation that is aligned with the Integrated Safety Management (ISM) requirement and participate in design and Management Prestart Reviews. Coordinate project interfaces and deployment interfacing with other organizations internal and external to the Laboratory. Lead and/or provide guidance and technical direction to multidisciplinary project teams in a growing, dynamic environment. Perform other duties as assigned. Additional job responsibilities, at the SES.4 level Set broad project vision and strategy and influence technical direction for self and others. Provide expert capability in highly complex mechanical design and analysis. This position requires an active Department of Energy (DOE) Q-level clearance or active Top Secret clearance issued by another U.S. government agency at the time of hire. Bachelor's degree in Mechanical Engineering or a related field, or the equivalent combination of education and related experience. Advanced knowledge of mechanical design. Significant experience in prototype development and testing, as well as hardware design and analysis. Ability to devise solutions for unique and complex problems. Ability and flexibility to reprioritize and change programmatic direction depending on emergent requests. Significant experience in managing, overseeing, and delivering multiple projects on budget and schedule. Ability to lead, manage, and mentor junior team members. Advanced communication skills with proven ability to present concepts and ideas in a clear and coherent manner, both verbal and written for presentation and interaction with other technical staff members. Additional qualifications at the SES.4 level Expertise in highly complex mechanical design and analysis and significant experience in project planning and highly complex technical leadership. Significant experience developing and implementing creative solutions to a diverse range of highly complex problems and leading corrective actions where necessary. Expert communication, facilitation, and collaboration skills necessary to present, explain, and advise senior management and/or external sponsors and proven record of team building and conflict resolution. Qualifications We Desire Master's degree or PhD in Mechanical Engineering or a related field. Advanced knowledge of systems engineering principles and practices and their application. Pay Range $175,530 - $267,060 Annually $175,530 - $222,564 Annually for SES.3 Level $210,630 - $267,060 Annually for SES.4 Level This is the lowest to highest salary in good faith we would pay for this role at the time of this posting. Pay will not be below any applicable local minimum wage. 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. #LI-Hybrid Position Information This is a Career Indefinite position, open to Lab employees and external candidates. Why Lawrence Livermore National Laboratory? Included in 2026 Best Places to Work by Glassdoor! Flexible Benefits Package 401(k) Relocation Assistance Education Reimbursement Program Flexible schedules (*depending on project needs) Our values - visit https://www.llnl.gov/inclusion/our-values Security Clearance This position requires an active Department of Energy (DOE) Q-level clearance or active Top Secret clearance

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