CACI is looking for a Space Vehicle and Robotics Systems Modeling and Simulation Engineer to work with NASA's Generic Robotics On-Orbit Trainer (GROOT) spacecraft simulation in support of our Nation’s space exploration initiative at NASA / Johnson Space Center in Houston, TX. This simulation is also used for on-orbit training for the United States Space Force (USSF). Candidates should have great interest in spacecraft vehicles and systems, enjoy working with software, and most of all, possess a great passion to contribute to our Nation’s exploration of space. This work involves software development, math model development, simulation integration, and simulation development on Linux PC platforms using the Trick© Simulation Environment and Development Toolkit. Individual will develop and integrate math models with Trick-based simulations developed at NASA in support of the on-orbit training for the USSF. The individual will develop high-fidelity software simulations and math models for generic spacecraft that can be customized for specific spacecraft designs. The ideal candidate has spacecraft domain experience in one or more of the following areas: avionics command and data handling, robotics, electrical power, environmental control and life support, fluids and thermal, orbital dynamics, robotic dynamics, orbital dynamics, Guidance, Navigation, and Controls. The engineer in this role will identify and implement improvements to math models and simulation scenarios, analyze simulation data to evaluate system characteristics and performance, and support continual enhancements to the simulation architecture. The engineer will support simulation and model validation and software verification. This position requires a self-motivated, capable person with strong verbal and written communication skills. In addition to outstanding technical expertise, the individual must be very people savvy with strong customer relationship skills, possess a positive team-player attitude, and be flexible and willing to take on new assignments and responsibilities as they arise. Finally, the most qualified candidate will be an articulate speaker able to communicate complex technical ideas in a convincing manner, must share our passion for our Nation's Space Program, and share in the excitement of developing the next human-rated space vehicles.