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Added 1 min ago
J
Welder / Fabricator
Jobot
El Cajon, CA
- $25 to $35 USD / hour
We are currently seeking a dynamic and skilled Construction Project Engineer (Electrical) to join our team. The ideal candidate will be an integral part of our construction projects,…
Added 3 mins ago
Test Engineer
Jabil Inc.
Florence, KY
Determine conditions under which tests are to be conducted and sequences and phases of test operations.
Added 3 mins ago
Senior Software Engineer, Full Stack
Lyric
Jefferson City, MO
Here's what makes this role different: you're not just a frontend engineer who "also knows AI." We want someone who has already figured out that tools like Cursor, Claude Code, and Codex…
Added 3 mins ago
Principal Engineer (Onsite)
Tyson Shared Services, Inc.
Springdale, AR
The Principal Engineer, Manufacturing Intelligence is a hands-on technical leader and the manufacturing subject matter expert for our enterprise digital manufacturing platform. This role is…
Added 6 mins ago
Information Assurance Security Engineer - Top Secret
General Dynamics Information Technology
Arnold, MO
At GDIT, people are our differentiator. As an Information Assurance Security Engineer, you will help ensure today is safe and tomorrow is smarter. Our work depends on a TS/SCI cleared…
Added 7 mins ago
CC
Applications Security Engineer II (SOAR)
Centene Corporation
Jefferson City, MO
- $75,300 to $135,400 USD / year
Position Purpose: The SOAR Engineer/Developer designs, develops, and maintains security orchestration and automation solutions that improve cybersecurity operations. The role develops SOAR…
Added 8 mins ago
A
Substation Engineer
Actalent
San Diego, CA
- $58 to $78 USD / hour
Substation Engineer (Remote or Hybrid | California Preferred)
Added 8 mins ago
Tooling/Project Engineer
Actalent
Plano, TX
The Tooling Engineer/Project Mechanical Engineer will play a key role in the design, procurement, fabrication, assembly, integration, start-up, and commissioning of very large-scale…
Added 8 mins ago
C
Sr. Full Stack Java & Azure Engineer
Cognizant
Jefferson City, MO
- $93,000 to $109,000 USD / year
As a Senior Full Stack Java & Azure Engineer, you will make an impact by designing and delivering secure, scalable, and maintainable cloud-native applications. You will work collaboratively…
Added 9 mins ago
Software Engineer
Cisco
Milpitas, CA
…deliver fixes or workarounds. Its work helps restore customer operations while bringing product insights back to engineering. You’ll have opportunities to apply AI and automation to analyze…
Added 9 mins ago
Quality Assurance Manager, Alexa Audio
Amazon.com Services LLC
Sunnyvale, CA · Bellevue, WA
Working with PM and TPM to understand new feature projects vision, oversee and influence QA engineers' test plan, test suites to ensure test coverage and define optimal test strategy,…
Added 12 mins ago
Program Quality Engineer
BAE Systems
Merrimack, NH
BAE Systems is looking for a Program Quality Engineer who will be a member of a cross-functional program team in our Wayne, NJ and our Merrimack, NH facility. They will contribute to…
Added 12 mins ago
Inside Systems Engineer
Forescout Technologies Inc.
Dallas, TX
Develop Proof-of-Concept (POC) test configurations based upon requirements agreed upon with the prospect to prove out the solution within the customer environment.
Added 16 mins ago
Material Planning Analyst - 1st Shift
GXO Logistics
West Memphis, AR
…analyses to improve the productivity and efficiency of our operations. If you’re ready to embrace a new challenge with a dynamic global company, we have an opportunity for you to grow with…
Added 17 mins ago
Mechanical Engineer
Waters Corporation
Milford, MA
Waters is seeking a Reliability Engineer II to join the Milford Operations Engineering organization. The Reliability Engineering (REL) Team is responsible for ensuring robustness and…
Added 18 mins ago
Package Design Engineer
Google
Sunnyvale, CA
You will manage all phases of the design process, including routing feasibility, test vehicle creation, product designs, conducting design reviews, artwork export, DFM process and…
Added 18 mins ago
Sr. Product Development Engineer - Product Operations
Advanced Micro Devices, Inc
Secaucus, NJ
AMD is seeking a Product Development Engineer, Product Operations to join our Datacenter Platform Engineering Group. In this role, you will drive the development and manufacturing launch of…
Added 18 mins ago
Product Application Engineer
Advanced Micro Devices, Inc
Austin, TX
…systems (benchtop and rackmount), networking, storage, system operations, debug, and repair of hardware as needed. Software and networking experience is vital to fully configure and enable…
Added 19 mins ago
Manufacturing Integration and Test Engineer
Epirus
Torrance, CA
Troubleshoot and resolve test failures, providing hands-on technical support to production technicians during testing operations
Added 19 mins ago
AC
Senior Mechanical Engineer - Instrumentation Hardware
Atom Computing
Boulder, CO
- $140,000 to $164,989 USD / year
We're looking for a Mechanical Engineer to join our Opto-Mechanical Engineering team to focus on designing the physical systems that house, protect, and connect our Control Systems and…
Added 20 mins ago
Manufacturing Engineer
Nammo Defense Systems, Inc
Mesa, AZ
…Nammo products that support the warfighter. The Manufacturing Engineer is responsible for the process, tooling, work instructions, and training required to deliver product safely,…
Added 20 mins ago
O
Network Engineer
Optimum
Parsippany, NJ
- $83,538 to $137,241 USD / year
The Optical Network Engineer position plays an important role within IPNT, it represents an experienced professional with a high technical skill set in the engineering and support role as…
Added 22 mins ago
Backend Software Engineer - Data Connectors
Palantir Technologies
NY
Palantir builds the world’s leading software for data-driven decisions and operations. By bringing the right data to the people who need it, our platforms empower our partners to develop…
Added 23 mins ago
Senior Software Quality Engineer
NCR VOYIX
IRVING, TX
…retailers and restaurants to accelerate new possibilities for their operations, experiences and business outcomes. NCR Voyix is headquartered in Atlanta, Georgia, and serves customers in…
Added 23 mins ago
Mechanical Technician – Facilities
Intuitive Machines LLC
Glen Burnie, MD
…all aspects of spacecraft subsystems design, development, and test, on-orbit operations, and…

LLNL

Senior Neutronics Engineer

Livermore, CA, United States

Pay Range $210,630 - $267,030 Annually This is the lowest to highest salary we in good faith believe we would pay for this role at the time of this posting.

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Job details

Pay: Pay Range $210,630 - $267,030 Annually This is the lowest to highest salary we in good faith believe we would pay for this role at the time of this posting.
Posting language: English
Posted: Nov 5, 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 an opening for a Senior Neutronics Engineer to support projects within the National Ignition Facility & Photon Sciences (NIF&PS) / Extreme Light Matter and Fusion (LMF) directorate, home to the National Ignition Facility (NIF), the world’s most energetic laser. In this role, you will work with the Radiation and Mutli-Physics Analysis Group, as well as other LLNL organizations, to perform complex radiation transport simulations of radiation environments in the NIF as well as other facilities. You will have advanced knowledge of radiation measurement techniques and work on characterizing the radiation field during NIF shots. You will work with LLNL team members to expand understanding of radiation effect on diagnostics, electronics and other materials. This position is in the Laser Systems Engineering & Operations (LSEO) Division of the Engineering Directorate. 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. In this role, you will

Operate under consultative direction with substantial authority, using in-depth analysis and subject matter expertise in highly advanced concepts, to resolve a diverse range of highly complex problems, independently determine strategies, modify approaches, and pursue actions that impact organizational operations or directions and achieve long-term goals.
Perform radiation transport simulations to identify radiological hazards and identify potential shielding solutions.
Perform detailed activation analyses and characterize decay dose rate environment.
Apply radiation transport methods to predict potential damage to electronics due to total ionizing dose, displacement damage and single event effects.
Characterize neutron sources and radiation fields affecting diagnostic systems.
Develop and optimize computational tools for coupling neutronics and activation analyses.
Support neutronics analysis activities in collaboration with the Livermore Institute of Fusion Technology (LIFT).
Prepare supporting safety and engineering documentation for complex analyses and safety base.
Lead and contribute to proposals for new work, applying appropriate estimating techniques.
Participate in professional committees, conferences, or working groups with other laboratories and/or government agencies and customers to develop business strategies and programs.
Prepare and present briefings to internal or external customers.
Maintain current knowledge of applicable regulatory Safety Standards and Emerging Modeling Tools.
Perform other duties as assigned.

Qualifications

Ability to obtain and maintain a U.S. DOE Q-level security clearance which requires U.S. citizenship.
Bachelor’s degree in Nuclear Engineering or related technical field, or the equivalent combination of education and previous relevant experience.
Extensive experience developing and applying radiation transport codes, such as MCNP, Open MC, SCALE, Shift, Attila, Denovo and ADVANTG.
Expert level application and experience developing and applying activation codes, such as FISPACT, ALARA, CINDER and ORIGIN.
Expert level experience applying CAD to Monte Carlo radiation transport codes using conversion tools such as GEONUED, McCAD and DAGMC.
Highly advanced knowledge of and significant experience with current state-of-the-art neutronics tool development.
Expert knowledge of and significant experience with radiation shielding for experimental facilities.
Expert knowledge of and significant experience in simulating post-irradiation environment in experimental facilities.
Expert knowledge of radiation measurement techniques.
Expert communication, facilitation, and collaboration skills necessary to prepare, present, and explain highly complex reports and effectively deliver highly advanced technical presentations, as well as influence and advise senior management and/or external sponsors.

Qualifications We Desire

PhD degree in Nuclear Engineering or related technical field, or the equivalent combination of education and previous relevant experience.
Significant experience in shielding design and simulation of post-irradiation environment to meet radiological protection goals in experimental facilities.
Experience with shielding design to allow for survivability of vulnerable electronics and other equipment in high radiation environments.
Experience with utilizing hybrid deterministic/Monte Carlo neutronics modeling.
Experience with developing novel approaches to predict radiation backgrounds in high radiation environments.
Experience with neutronics and activation analyses for magnetic and inertial fusion facilities and/or fusion power plant studies.
Experience with applying sensitivity and uncertainty methods using tools such as ASUSD and SUSD3D to quantify nuclear data and modeling uncertainties.
Experience with performing verification and validation using operating data and shielding benchmark studies.
Experience in leading projects and managing project schedules.
Knowledgeable about Monte Carlo radiation transport using GPU architectures.

Pay Range $210,630 - $267,030 Annually 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

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 a Department of Energy (DOE) Q-level clearance. If you are selected, we will initiate a Federal background investigation to determine if you meet eligibility requirements for access to classified information or matter. Also, all L or Q cleared employees are subject to random drug testing. Q-level clearance requires U.S. citizenship.

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.

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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