Principal Spacecraft Guidance, Navigation & Control Engineer

Principal Spacecraft Guidance, Navigation & Control Engineer

Rockville, MD or Hawthorne, CA

Who We're Looking For

Quantum Space is redefining mobility and maneuverability in space. Our high-mobility spacecraft platforms support national security, civil, and commercial missions with unmatched flexibility and propulsion capability. We build fast and iterate quickly.

We are seeking a Principal Spacecraft Guidance, Navigation & Control Engineer to serve as the technical authority for the GNC subsystem across multiple spacecraft programs, leading architecture, design, procurement, integration, and verification.

Where You'll Make an Impact

• Own the end-to-end GNC/ACS architecture from concept development through flight operations.
• Own GNC subsystem level requirements.
• Lead spacecraft attitude and control system design, including actuator sizing, sensor selection, control authority, and momentum management strategy.
• Define and implement control laws for high-ΔV maneuvering, precision pointing, station-keeping, and proximity operations.
• Architect state estimation frameworks (EKF/UKF, sensor fusion pipelines, covariance management) for robust on-orbit performance.
• Develop and maintain high-fidelity 6
  
  DOF spacecraft simulation environments for analysis, trade studies, verification, and anomaly resolution.
• Establish GNC verification and validation strategy across analysis, SIL/HIL, hardware integration, and flight test.
• Support propulsion-coupled dynamics modeling, including thrust misalignment, slosh effects, and flexible-body considerations as needed.
• Lead GNC participation in system-level reviews (MCR, SRR, PDR, CDR, TRR) and serve as the primary technical voice for the discipline.
• Analyze flight telemetry and test data to assess performance, diagnose anomalies, and drive configuration or algorithm updates.
• Define safe-mode, fault management, and degraded control strategies in partnership with FSW and systems engineering.
• Mentor and manage GNC engineers, establishing best practices, code standards, simulation frameworks, and technical rigor across the team.
• Support early-orbit operations and critical mission phases as required.

What It Takes

• B.S., M.S., or Ph.D. in Aerospace Engineering, Mechanical Engineering, Electrical Engineering, Robotics, or related field.
• 15+ years of experience in spacecraft GNC/ACS development, including full lifecycle flight programs.
• Demonstrated ownership of a spacecraft attitude and/or orbit control system through design, integration, and flight.
• Deep expertise in rigid-body dynamics, orbital mechanics, estimation theory, and modern control methods.
• Strong experience with thruster-based ACS architectures and propulsion-coupled control systems.
• Proven ability to independently architect GNC systems and make system-level trade decisions.
• Experience implementing flight algorithms in C++, Python, or MATLAB/Simulink, with awareness of real-time constraints.
• Experience integrating GNC with flight software and avionics, including SIL/HIL validation.
• Ability to analyze telemetry and diagnose complex on-orbit or integrated system anomalies.
• Systems-level thinking across propulsion, avionics, software, and mission design.
• Demonstrated technical leadership and mentorship experience.
• Comfort operating in a fast-paced, hardware-integrated environment with evolving mission needs.

Nice-to-Have Experience

• Experience with high-ΔV vehicles, cislunar missions, GEO servicing, or RPO missions.
• Background in autonomous maneuver planning or onboard decision-making systems.
• Experience with flexible-body dynamics, propellant slosh modeling, or structural-control interaction.
• Familiarity with MAX FSW and MAX GDS or other modern COTS flight software frameworks.
• Experience with multi-agent relative navigation or machine learning for estimation, perception, or task planning.
• Experience leading small technical teams in startup or New Space environments.
• Prior support of on-orbit commissioning or anomaly resolution efforts.

What You'll Get

• Ownership– Build and validate the GNC capability that defines how our spacecraft maneuver, point, and operate autonomously.
• Innovation– Shape next-generation GNC architectures, algorithms, and tools for…