Mechanical Engineer Jobs

Mechanical Engineer

Join us and make YOUR mark on the World! 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.

We have an opening for a Mechanical Engineer to participate in new and ongoing projects within our Initiation Systems Group (ISG). The Initiation System Group provides nuclear weapon engineering design expertise; integration within systems engineering; experimental device design; shock & vibration and thermal testing; fabrication and assembly; and assessment of nuclear stockpile components for evaluation and maintenance of the enduring and future nuclear weapon stockpile with most of your focus on the ISG products. You will 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 (SD) 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. This position 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:

• Derive engineering requirements, develop conceptual designs, and perform supporting assessment of mechanical systems, test prototypes, and associated diagnostics.
• Assist and support the detail design process, component part fabrication, and unit assembly.
• Prepare supporting safety and engineering documentation and participate in engineering design reviews.
• Participate in engineering testing operations, analyze results, and write reports.
• Generate detailed plans, schedules, and budgets for project activities.
• Interface with other organizations internal and external to the Laboratory to complete various projects.
• Work independently as well as a part of a multidisciplinary team.
• Perform other duties as assigned.

Additional job responsibilities, at the SES.2 level:

• Provide comprehensive engineering knowledge to resolve technical and programmatic issues, using the broad application of technical concepts and techniques.
• Perform independent technical tasks to provide solutions for a diverse range of moderate to complex issues that require the creative use of established or innovative methods.
• Select methods, techniques, and evaluation criteria to obtain results based on analysis of multiple, largely identifiable factors.
• May represent the organization by providing input on technical issues for specific projects.
• May provide guidance and/or informal mentoring to less-experienced team members.

Qualifications:

• Ability to secure and maintain a U.S. DOE Q-level security clearance which requires U.S. citizenship.
• Bachelor's degree in Mechanical Engineering or related field, or the equivalent combination of education and related experience.
• Fundamental knowledge in at a minimum of two of the following areas: engineering hardware design, systems engineering, manufacturing techniques, testing processes.
• Working knowledge of and/or experience with design principles.
• Working knowledge of material properties and manufacturing methods.
• Experience working effectively in a multidisciplinary team environment.
• Desire to work on National Security projects related to nuclear weapons and flexibility to work in different technical areas.
• Sufficient verbal and written communication skills to collaborate effectively in a team environment and present and explain technical information.

Additional qualifications at the SES.2 level:

• Comprehensive knowledge of engineering hardware design, fabrication, or testing processes and the ability to meet schedule and deliverables for multiple concurrent projects with a range of priorities.
• Proficient verbal and written communication skills necessary to effectively collaborate in a team environment and present and explain technical information.
• Production experience

Qualifications We Desire:

• Master's degree in Mechanical Engineering or related field.
• Ability to interpret specifications and mechanical drawings including Geometric Dimensioning & Tolerancing (GD&T).
• Experience using standard project management practices.
• Knowledge of design applications employing high explosive materials.
• Experience working in an environment with stringent safety and security policies.
• Certified in Six Sigma Green Belt
• Industry experience in aerospace, gas & oil, or medical

Pay Range $121,830 - $185,544 Annually $121,830 - $154,500 Annually for the SES.1 level $146,340 - $185,544 Annually for the SES.2 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.

Additional Information #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