Modeling & Simulation Software Developer - Postdoctoral Researcher

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 important for continued success of the Laboratory’s mission.

Pay Range

$118,884 Annually

Job Description

We have an opening for a Modeling & Simulation Software Developer – Postdoctoral Researcher who will work with a team of scientists to develop, run, and study results from large parallel simulations related to the national defense.

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.

You will

• Design algorithms for efficient parallel solution of PDEs under constraints.
• Develop code in C++ for an existing parallel application.
• Analyze code performance and establish benchmarks/validation.
• Write high-quality software with adherence to professional best practices including using Git, unit testing, and writing documentation.
• Maintain an awareness of technical literature in relevant areas, publish research results in peer-reviewed scientific or technical journals, and present results at internal progress meetings, external conferences, seminars, and/or technical meetings.
• Perform other duties as assigned.

Qualifications

• Ability to secure and maintain a U.S. DOE Q-level security clearance which requires U.S. citizenship.
• PhD in computational physics, computer science, engineering, or a related technical field.
• Experience with the development of parallel codes, including MPI, C++, and Git.
• Experience with running parallel codes on high-performance computing infrastructure.
• Ability to find innovative solutions to complex scientific and technical problems.
• Interpersonal skills necessary to interact with a diverse set of scientists, engineers and other technical and administrative staff.
• Proficient verbal and written communication skills necessary to work in a multidisciplinary team environment, author technical and scientific reports and publications and deliver scientific presentations.

Qualifications We Desire

• Experience with GPU accelerated codes.
• Experience with molecular dynamics simulation, computational fluid dynamics, or optimization methods.

Additional Information

#LI-Hybrid

Position Information

This is a Postdoctoral appointment with the possibility of extension to a maximum of three years, open to those who have been awarded a PhD at time of hire date.

Why Lawrence Livermore National Laboratory?

• Included in 2025 Best Places to Work by Glassdoor!
• Flexible Benefits Package
• 401(k)
• Relocation Assistance
• Education Reimbursement Program
• Flexible schedules (*depending on project needs)
• Inclusion, Diversity, Equity and Accountability (IDEA) - visit https://www.llnl.gov/diversity
• Our core beliefs - visit https://www.llnl.gov/diversity/our-values 
• Employee engagement - visit https://www.llnl.gov/diversity/employee-engagement

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 po