Design Physicist - Active Security Clearance Required

Lawrence Livermore National Laboratory; Livermore (CA); Hybrid; USD 146,000 - 223,000; Full time

Benefits offered by this job

Flexible Benefits Package

Relocation Assistance

Education Reimbursement Program

Flexible schedules

Job summary

Lawrence Livermore National Laboratory seeks an exceptional Physical Scientist/Engineer to advance national-security physics in the Design Physics Division. The role covers computational, theoretical, and experimental work on nuclear explosives, with potential hybrid scheduling after a probationary period.

Travel and collaboration with DOE/NNSA and interagency teams are expected. The position offers growth across SES levels with responsibilities spanning research, publication, and stewardship of

Qualifications

• Active DOE Q-level or Top-Secret clearance at hire.
• PhD in physics, engineering, or related field.
• Record of outstanding research in relevant physics/engineering areas.
• Experience with computer-based design and analysis of experiments.
• Aptitude for mastering new physics fields; breadth of understanding of complex processes.
• Experience using advanced computational facilities for applied physics analysis.
• Proficient written and oral communication and presentation skills.
• Experience working independently and in multidisciplinary teams.
• Self-motivation and initiative in addressing challenging problems.

Responsibilities

• Assess complex physics interactions that occur in nuclear explosions.
• Design and analyze experiments exploring nuclear explosives physics.
• Simulate weapons phenomena and perform assessments using computer codes.
• Define and implement stockpile stewardship for specific weapons systems.
• Present results at conferences and in publications, with open and classified work as needed.
• Interact with external stakeholders at DOE/NNSA and interagency partners.
• Develop expertise in interrelated physics fields for weapons assessment.
• Travel minimally or substantially based on project needs.
• Perform other duties as assigned.
• SES.3: Independently develop and assess complex physics interactions in nuclear explosions.
• SES.3: Serve as technical expert on a multidisciplinary team.
• SES.3: Guide analysis and lead design of nuclear explosives experiments.

Skills

DOE Q clearance

Strong communication

Independent work

Multidisciplinary teamwork

Education

PhD in physics or engineering

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 are seeking an exceptionalPhysical ScientistandEngineerwith a background in fields such as plasma physics,radiation transport, atomic physics, nuclear physics, physical chemistry, condensed matter physics, computational physics, or hydrodynamics. Our national-security mission encompasses aspects of computational, theoretical, and experimental physics associated with the complex processes of nuclear explosives. Under limited direction, you will be responsible foradvancing our understanding and developing methodologies for important national-security challenges. This position is in the Design Physics Division within the Strategic Deterrence Directorate.

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.

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

• Assess the complex physics interactions that take place in nuclear explosion.
• Design and provide analysis of experiments exploring the physics of nuclear explosives.
• Simulate weapons phenomena and perform weapons assessment and certification tasks using physical models in computer codes.
• Define and implement stockpile stewardship for specific weapons systems.
• Present and disseminate research results at scientific conferences and in peer-reviewed publications, in both open and classified environments, internal and external to LLNL. Responsibilities may also include interacting with external stakeholders, both at DOE/NNSA and across the broader interagency, as well as via offsite assignments.
• Develop expertise in interrelated fields of physics important to weapons assessment and certification.
• Travel minimally or substantially based on needs of projects.
• Perform other duties as assigned.

Additional job responsibilities at the SES.3 Level

• Independently develop, assess and provide in depth analysis of the complex physics interactions that take place in nuclear explosion where problems may not be well defined.
• Work as technical expert on multidisciplinary team.
• Guide the analysis and lead the design of experiments exploring the physics of nuclear explosives.

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.
• PhD in physics, engineering, or a related field or equivalent level of demonstrated knowledge.
• Record of completing outstanding research in relevant areas of physics and engineering.
• Experience with computer-based design and analysis of experiments.
• Aptitude for mastering new fields of physics; a record of creativity, physical insight, and breadth of understanding in applications of complex physical processes.
• Experience in using advanced computational facilities for applied physics analysis and conducting applied physics research.
• Proficient verbal and written communication and presentation skills necessary to author technical and scientific reports, publications, invited papers, and to deliver scientific presentations.
• Experience working effectively independently and in a multidisciplinary, team-research environment.
• Self-motivation and initiative in addressing challenging problems.

Additional qualifications at the SES.3 Level

• Advanced knowledge of physics, engineering, or a related field.
• Significant experience and ability to lead independent work conducting applied physics research.
• Record of leading top quality research in relevant areas of physics and engineering

Pay Range

$146,340 - $222,564 Annually

$146,340 - $185,544 Annually for the SES.2 level
$175,530 - $222,564 Annually for the SES.3 level

This is the lowest to highest salary we in good faith believe 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-Hybrid

Position Information

This is a Career Indefinite position, open to Lab employees and external candidates.

Why Lawrence Livermore National Laboratory?

• Included in 2026Best Places to Work by Glassdoor!
• FlexibleBenefits Package
• 401(k)
• Relocation Assistance
• Education Reimbursement Program
• Flexible schedules (*depending on project needs)
• Our values - visithttps://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 useand/or possession ofmobile devices in Limited Areas. Depending on your job duties, you may be required to work in a Limited Area whereyou are not permitted to have a personal and/or laboratory mobile devicein your possession. This includes, but not limited to cell phones, tablets, fitness devices, wireless headphones, and other Bluetooth/wireless enabled devices.

Ifyou useamedical device, whichpairs with a mobile device,you must still follow the rules concerningthe mobile device in individual sections within Limited Areas. Sensitive Compartmented Information Facilities requireseparate 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.

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.

CaliforniaPrivacy Notice

The California Consumer Privacy Act (CCPA) grants privacy rights to all California residents. The law also entitlesjob 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.