Guidance, Navigation & Control (GNC)Flight Dynamics Software Developer

We have an opening for a Guidance Navigation & Control (GNC)/Flight Dynamics Software Developer in support of the Flight Performance Integration (FPI) program. FPI supports LLNL weapon system design and assessments with modeling and simulation utilizing custom in-house computational codes. You will perform code development work focused on a Python modeling environment (library) to generate an integrated tool to interface with multiple engineering solvers and post-processing applications. This will involve developing methods and tools to streamline the engineering workflow facilitate automation and provide drop-in automated data extraction. This work prepares for a planned AI driven virtual design assistant. This position is in the Computational Engineering Division (CED) within the Engineering Directorate.

This position will be filled at either level based on knowledge and related experience as assessed by the responsibilities (outlined below) will be assigned if hired at the higher level.

You will

• Contribute to the development of new aerospace engineering analysis capabilities such as optimal control advanced 3DoF trajectory optimization 6DoF trajectory optimization and autopilot design software.
• Support concept trade studies and derive GN&C requirements for future systems utilizing in-house flight simulation tools and engagement modeling codes such as AFSIM.
• Contribute to the development of tools for managing CFD Trajectory Finite Element Analysis (FEA) and other numerical modeling workflows including preprocessing post-processing and data management. Perform analysis of with a variety of flight modeling related tools with an emphasis on assembling them to enable novel analysis at scale utilizing high-performance computing (HPC) resources.
• Support engineering and flight modeling analysts including debugging problems providing alternative solutions and quick feature implementation.
• Document methods and implementation in both informal and formal reports and presentations. Share relevant knowledge analysis and recommendations in collaboration with internal and external scientists engineers mathematicians and computer scientists through reviews and working groups. Collaborate with other development teams working on tools that support analysis workflows.
• Perform other duties as assigned.

Additional job responsibilities at the SES.3 level 

• Independently determine technical objectives and criteria to satisfy project deliverables and execute the appropriate technical approaches.
• Apply advanced technical knowledge and best practices to guide successful completion of project and organizational goals.
• Lead and mentor junior staff student fellows and summer student researchers.

Qualifications :

• Ability to secure and maintain a U.S. DOE Q-level security clearance which requires U.S. Citizenship.
• Masters degree in engineering computational science applied math physics or related field or the equivalent combination of education and related experience.
• Demonstrated programming ability in Python C C FORTRAN or similar languages.
• Proficient understanding of computational vehicle dynamics via 3-DoF and/or 6-DoF flight/reentry modeling including familiarity with aerodynamic performance coefficients.
• Proficiency in vector calculus linear algebra and numerical methods for solving differential equations (ODEs/DAEs).
• Knowledge of trajectory optimization tools and methods such as GPOPS-II Dymos OTIS TAOS STK or similar. Knowledge of dynamic optimization methods such as direct collocation shooting methods nonlinear programming sequential quadratic programming algorithmic differentiation and related tools such as CasADI Pyomo IPOPT & SNOPT.
• Proficient interpersonal written and verbal communication skills necessary to effectively present and explain technical information.
• Ability to work in a multidisciplinary team environment as well as independently.
• Ability to travel.

Additional qualifications at the SES.3 level 

• Advanced knowledge and significant experience in computational modeling & Multi-disciplinary Design and Analysis Optimization (MDAO) including significant experience in developing modeling & simulation tools for aerospace applications.
• Significant experience with one or more programming languages such as Python C/C FORTRAN or other object oriented programming (OOP) languages.
• Advanced verbal and written communication skills necessary to effectively collaborate in a team environment and present and explain technical information and provide advice to management.

Qualifications We Desire

• PhD in engineering computational science applied math physics or related field.
• Experience conducting computational analysis in a multi-physics context and with software on massively parallel systems particularly in the areas of heat transfer fluid dynamics and/or structural mechanics.
• Experience in development of software in a version-controlled environment (e.g. git) including testing documentation and software user support.
• Experience with machine learning frameworks (e.g. torch/pytorch tensorflow jax) and models as well as training and fine-tuning models and one or more of the following: non-linear programming and optimization uncertainty quantification Bayesian learning UI/UX design.

Pay Range

$146340 - $222564

$146340 - $185544 Annually for the SES.2 level

$175530 - $222564 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; pay will not be below any applicable local minimum wage. An employees 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 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  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. 

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  Remote Work :

  No

  
  

  Employment Type :

  Full-time