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Designer I, Distribution
Disaster Resource Group
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Prepare project and job packages that include material lists, requisitions, labor estimates, sitedrawingsand construction drawings for various installations of electrical facilities in a…
Added just now
Software Engineer Intern
FlightSafety International Inc
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As a Software Engineer Intern on the Signing Core Backend (SCORE) team, you will help re-architect Docusign's eSign branding capability into a centralized microservice that high-value…
Added 1 min ago
Senior Encryption Engineer (Data at Rest)
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United States
The Senior Encryption Engineer (Data at Rest) is responsible for supporting and securing enterprise-scale data protection platforms across hybrid cloud and on-prem environments, with a…
Added 1 min ago
Project Engineer
DPR GP
Denver, CO
…and always act in the best interest of the team, customer, project and…
Added 1 min ago
Field Engineer
DPR GP
Denver, CO
…and always act in the best interest of the team, customer, project and…
Added 1 min ago
Sr VDC Engineer
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…and always act in the best interest of the team, customer, project and…
Added 2 mins ago
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Engineer
AEP Service Corporation
New Albany, OH
Initiates corrective action when project objectives are not being met.
Added 3 mins ago
Senior Engineering Project Manager - iCloud / Apple Services Engineering
Apple
Seattle, WA
This role suits a project manager with a strong technical bent, or a release engineer who is highly organized and wants to help drive software from code to customer.
Added 3 mins ago
Automation Project Execution Engineer & Layout Specialist
Kimberly-Clark USA, LLC
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Driving TSP engagement and collaborating with Procurement and project teams to achieve key project objectives and metrics.
Added 3 mins ago
QI
Senior Project Manager (Columbus, OH)
Quanta Infrastructure Solutions Group, LLC
Columbus, OH
- $180,000 to $210,000 USD / year
…use in-house talent, expertise and resources to plan, design, engineer, manage, conduct maintenance on and construct…
Added 4 mins ago
A
Substation Engineer
Actalent
San Diego, CA
- $58 to $78 USD / hour
Substation Engineer (Remote or Hybrid | California Preferred)
Added 4 mins ago
NM
Project Engineer
Noble Machines, Inc
Sunnyvale, CA
- $150,000 to $210,000 USD / year
The Project Engineer manages the path from lab capability to repeatable, measured, on-site performance. You integrate Moby’s software and hardware for a customer’s environment, prove it…
Added 5 mins ago
Structural Engineer (6+ years experience)
KPFF Consulting Engineers
St. Louis, MO
Occasionally visiting project locations and performing field inspections which may involve walking, standing, kneeling, or navigating uneven terrain.
Added 5 mins ago
Entry-Level Structural Engineer 0-2 yrs exp
KPFF Consulting Engineers
St. Louis, MO
We are seeking an Entry-Level Structural Engineer to join our growing engineering team in St. Louis, Missouri. This role offers an excellent opportunity for recent graduates or early-career…
Added 5 mins ago
A
Construction Superintendent
Actalent
Apopka, FL
- $40.87 to $48.08 USD / hour
Identify long-lead items and collaborate with the Project Engineer to prevent schedule impacts.
Added 5 mins ago
A
Construction Superintendent
Actalent
Apopka, FL
- $40.87 to $48.08 USD / hour
Identify long-lead items and collaborate with the Project Engineer to prevent schedule impacts.
Added 5 mins ago
Electrical Engineer
Actalent
Westlake, OH
Provide technical support and project leadership by reporting progress, answering engineering questions, and maintaining accurate technical data and documentation.
Added 5 mins ago
A
Substation Engineer
Actalent
Austin, TX
- $55 to $70 USD / hour
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Added 5 mins ago
Systems and Server Virtualization Engineer
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Weymouth, MA
…teams, vendors, and clinical or operational stakeholders to engineer and support resilient infrastructure solutions that enable patient care and business…
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Instrumentation Controls & Power Generation Manager
Louis Dreyfus Company
Grand Junction, IA
Prepare documentation diagrams, process control narratives, instrumentation lists, I/O lists, as any part of project design or maintenance activities
Added 6 mins ago
MD
Director of Engineering and Construction (DOT MAA Executive)
Maryland Department of Transportation
Linthicum Heights, MD
- $148,428 to $196,116 USD / year
…Engineering (P&E). This position reports directly to the Deputy Chief Engineer and supports the Chief Engineer in delivering a complex, multi-billion-dollar capital improvement program…
Added 7 mins ago
IT Network and End User Support Engineer - Riverton, Wyoming
RIVERTON, WY
The IT Network & End User Support Engineer provides intermediate-level technical support to maintain secure, reliable network, telecommunications, and end-user technology services across…
Added 8 mins ago
Conveyor Systems Designer
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Troy, MI
Lay out and engineer overhead and floor conveyor systems at the system level (power-and-free, enclosed track, chain-on-edge, skillet, roller, lift/transfer)
Added 8 mins ago
Senior Mechanical Engineer Project Manager
RE/SPEC Inc.
Morgantown, WV
RESPEC seeks an experienced Senior Mechanical Engineer Project Manager to support our energy, wastewater, mining, and industrial projects.

LLNL

Senior Mechanical Engineer - Active Clearance Required

Livermore, CA, United States

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Job details

Posting language: English
Posted: Nov 9, 2026

Original job description

Company Description 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.

Job Description

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.

Qualifications

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. Additional Information

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 issued by another U.S. government agency at time of hire.

Pre-Employment Drug Test External applicant(s) selected for this position must pass a post-offer, pre-employment drug test. This includes testing for use of marijuana as Federal Law applies to us as a Federal Contractor.

Wireless and Medical Devices Per 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. Hearing aids without wireless capabilities or wireless that has been disabled are allowed in Limited Areas, Secure Space and Transit/Buffer Space within buildings.

Pre-Placement Medical Exam A job related pre-placement medical examination may be required.

How to identify fake job advertisements Please 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. If you have encountered a job posting or have been approached with a job offer that you suspect may be fraudulent, we strongly recommend you do not respond. To learn more about recruitment scams: https://www.llnl.gov/sites/www/files/2023-05/LLNL-Job-Fraud-Statement-Updated-4.26.23.pdf

Equal Employment Opportunity We are an equal opportunity employer that is committed to providing all with a work environment free of discrimination and harassment. 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 Accommodation Our 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 Notice The 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. The Employee Privacy Notice can be accessed here.

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More about this job

Skills

Assembly
Provide technical expertise
Research
Mechanical systems
Health and safety
Documentation
Mechanical engineering
Design hardware
Communication skills
Leadership
Collaboration
Team building
Conflict resolution
Engineering principles

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