Keyword Search

Back to open positions

Modeling and Simulation Software Engineer

Mid-Senior Level | Full-time
Information Technology/Computing | livermore, CA | 05/26/2023

Apply Now  

Company Description

Join us and make YOUR mark on the World!

Are you interested in joining some of the brightest talent in the world to strengthen the United States’ security? Come join Lawrence Livermore National Laboratory (LLNL) where our employees apply their expertise to create solutions for BIG ideas that make our world a better place.

We are committed to a diverse and equitable workforce with an inclusive culture that values and celebrates the diversity of our people, talents, ideas, experiences, and perspectives. This is essential to innovation and creativity for continued success of the Laboratory’s mission.

A hybrid schedule is subject to change and determined by the needs of the project. You may be asked to be onsite more frequently in some circumstances.

Pay Range

$148,650 - $190,932 Annually for the SES.3 level
$178,410 - $229,116 Annually for the SES.4 level

Please note that the pay range information is a general guideline only. Many factors are taken into consideration when setting starting pay including education, experience, the external labor market, and internal equity.

Job Description

ReWe have an opening for a Modeling and Simulation Software Developer to support the Engagement Modeling project in the Weapon Technologies and Engineering Program. This position is in the Applications, Simulations and Quality (ASQ) Division within the Computing Directorate.

You will work with a team of security experts and Software Engineers to support and apply software and security engineering skills on a variety of application platform to identify and remediate security issues, lead integration efforts for new deployment services and design and develop new functionality for existing environments. You will work in an environment that focuses on problems of interest to LLNL and Department of Energy (DOE) programs as a member of a dynamic, multidisciplinary team environment. You will apply fundamental knowledge of HPC software development and contribute to technical projects using creativity and imagination.

In this role you will

  • Obtain and deploy the latest updates of industry/government standard tools and ensure that they available to users.
  • Develop software necessary to allow users/analysts to run simulation at scale in HPC.
  • Develop tools necessary to connect/federate existing tools to create a combined ability utilizing best aspects of each. 
  • Advise and aid other developers, including engineers, in writing and adding capabilities.
  • Maintain QA and Continuous Integration/Continuous Deployment (CI/CD [ES1] [BJ2] ) infrastructure to ensure verified and credible tools as well as robustness.
  • Prioritize and establish feature plans working with users and project management.
  • Support the development of documentation and training material.
  • Support users with identifying bugs and provide fixes.

 Additional job responsibilities at the SES.4 Level

  • Independently solve moderately complex problems existing throughout a heterogeneous distributed environment.
  • Provide technical leadership and guide efforts to develop tools or processes for improving the efficiency and technical operations of users and staff.
  • Effectively perform duties using independent judgment and minimal direction.



  • Ability to obtain and maintain a US DOE Q-level security clearance which requires U.S. Citizenship. 
  • Bachelor’s degree in Computer Science, Computer Engineering, or a related field, or the equivalent combination of education and related experience.
  • Proficiency in securing Unix/Linux systems in a production environment.
  • Strong proficiency with C/C++.
  • Broad experience with Java, Python, Bash, or similar scripting / languages, particularly for use in automation processes.
  • Strong understanding of software development fundamentals (object-oriented programming, data structures, algorithms, unit testing).
  • Ability to work with subject matter experts to develop tools for engineering applications. [ES1] [BJ2] .
  • Advanced Knowledge of software testing and quality assurance strategies.
  • Familiarity with version control systems.
  • Experience learning new languages including non-standard domain specific languages with engineering concepts.
  • Knowledgeable with CI/CD.
  • Extensive experience as a software developer.
  • Proficient written and verbal communication skills necessary to effectively collaborate in a multi-disciplinary team environment, as well as the ability to work effectively with minimal guidance and as part of a team.

Additional Qualifications at the SES.4 Level

  • Highly advanced experience with implementing solutions to meet Engineering programmatic needs.
  • Highly advanced analytical and problem-solving skills to contribute to creative solutions to complex problems in cross-organizational efforts.
  • Advanced verbal and written communication and interpersonal skills necessary to work effectively in a technical team environment and to represent LLNL in public forums.

Additional Information

Qualifications We Desire

  • Broad experience with High Performance Computing environments.
  • Experience in GitLab, pytest, and Sphinx documentation.
  • Experience with combat simulation frameworks AFSIM, EADSIM, JCATS/JLOD, STORM, ITASE, Sonic.
  • Global modeling and data visualization, such as, GIS, Ansys STK, Worldwind or similar.

Position Information

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

Why Lawrence Livermore National Laboratory?

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.

Beware of Fraudulent Job Postings. LLNL’s hiring practices:

  • Never requires job applicants to pay an application/training fee or submit personal documents like bank account details, passport number, Social Security number, tax forms or credit card information as part of the application process. 
  • For interviews and to be granted access to a Federal facility, a LLNL employee will contact you directly to collect visa, passport number, and/or Social Security number.  To vet the authenticity of the employee please have them provide you their name and phone number and verify at
  • Involves at least one interview (virtual or in-person) and never interviews job applicants through chat platforms such as Google Hangouts, or via correspondence through text and instant messaging systems.
  • Only sends email communications to job applicants from domain “” or via their applicant tracking system, [email protected]. Occasionally LLNL uses third-party vendors that will contact you about job opportunities.  If a recruiter contacts you to apply, you will always be directed to our career page to apply through our career site.
  • Encourages all applicants to visit LLNL’s careers page at if they saw the job posting on another site prior to applying to ensure the job posting is accurate and valid.

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.

We invite you to review the Equal Employment Opportunity posters which include EEO is the Law and Pay Transparency Nondiscrimination Provision.

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.

Apply Now  

Refine Search Clear All

Career Areas

Show More

Experience Level

Employment Type



Show More

Security Clearance