Principal GNC Engineer

Responsibilities

• Own end-to-end development of spacecraft Guidance, Navigation, and Control (GNC) systems, including architecture definition, algorithm design, software implementation, hardware integration, verification, and flight operations
• Design, test, and validate GNC flight software for spacecraft operating in LEO, GEO, and cislunar environments
• Develop advanced attitude and orbit determination algorithms, including sensor fusion, state estimation, covariance analysis, and Kalman filtering (EKF/UKF/batch)
• Design control laws for attitude control, orbit control, maneuver execution, and closed-loop guidance, ensuring required performance and robustness under uncertainties
• Create and improve high-fidelity 6-DOF simulations, sensor/actuator models, disturbance environments, Monte Carlo pipelines, and SIL/HIL integration
• Conduct system-level GNC trade studies and develop recommendations for hardware such as reaction wheels, torque rods, thrusters, star trackers, IMUs, GNSS units, and optical navigation sensors
• Define GNC subsystem requirements, interfaces, calibration procedures, verification/validation plans, and support design reviews (SRR/PDR/CDR)
• Work cross-functionally with avionics, software, propulsion, mechanisms, mission operations, and systems engineering teams to ensure seamless integration of GNC functionality
• Support on-orbit commissioning, calibration, maneuver planning, fault investigation, and anomaly resolution
• Mentor junior engineers, lead design/code reviews, and help establish GNC best practices, tools, and development standards

Qualifications

• Bachelor’s degree in aerospace engineering, mechanical engineering, physics, or related discipline (advanced degree preferred)
• 15+ years of hands-on experience developing and fielding spacecraft GNC systems
• Strong proficiency in C++ and Python, including software development, numerical methods, and algorithm implementation
• Deep understanding of spacecraft attitude dynamics, orbital mechanics, environmental perturbations, and actuator/sensor physics
• Significant experience with estimation and filtering (EKF, UKF, batch least squares), sensor fusion, covariance analysis, and navigation performance assessment
• Experience designing control laws and performing stability, robustness, and frequency-domain analysis
• Demonstrated ability to develop and maintain complex high-fidelity simulations and Monte Carlo frameworks
• Experience testing and integrating GNC algorithms with flight hardware, including star trackers, IMUs, reaction wheels, GN&C avionics, and propulsion components
• Experience defining subsystem requirements, verification plans, and participating in formal design reviews
• Able to lead cross-disciplinary technical efforts and deliver results with minimal direction
• Strong communication skills and ability to mentor and guide less experienced engineers
• U.S. Citizen and eligible for DoD Secret or TS/SCI clearance

Preferred Skills And Experience

• Experience developing GNC systems for proximity operations, formation flying, optical navigation, autonomous maneuvering, or precision pointing missions
• Expertise with FDIR related to GNC components, including failure detection, isolation, and recovery techniques
• Experience with autonomous guidance or onboard trajectory optimization
• Familiarity with safety-critical or fault-tolerant flight software architectures
• Experience with real-time operating systems, embedded software, and hardware-in-the-loop testbeds
• Track record of technical leadership, ownership of major subsystem design, or architecting full GNC solutions

Pay

Colorado Base Salary: $180,000 - $305,000

Equity + Benefits including Health, Dental, Vision, HRA/HSA options, PTO and paid holidays, 401K, Parental Leave

Additional Requirements

• Work Location—This is an onsite position, successful candidates will be located near Long Beach, CA or Denver, CO.
• Work environment—the work environment; temperature, noise level, inside or outside, or other factors that will affect the person's working conditions while performing the job.
• Physical demands—the physical demands of the job, including bending, sitting, lifting and driving.