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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-V 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 6DOF 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-V vehicles, cislunar missions, GEO servicing, or RPO missions. 
• Experience designing control systems for agile or propulsive maneuvering spacecraft. 
• 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 NewSpace 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 high-agility missions. 
• Impact- Directly influence spacecraft controllability, autonomy, and mission success across cislunar and GEO operations. 
• Growth- Collaborate across avionics, FSW, systems, and mission ops, with opportunities to expand into dynamics modeling, autonomy, or flight operations. 
• Compensation - Competitive salary, equity, and comprehensive benefits including medical, dental, vision, generous leave, HSA, 401(k) matching, and equity participation. 

Location: Rockville, MD or Hawthorne, CA

Base Salary: $175,000 - $225,000

The salary range for this role is determined based on a variety of factors including work experience, education, technical expertise, certifications, critical skills, and business considerations. Highly competitive equity grants are included in the majority of full-time offers and are considered part of Quantum Space's total compensation package. 

Additional Requirements 

To comply with U.S. Government space technology export regulations, including ITAR, applicants must be a U.S. citizen, lawful permanent resident, protected individual under 8 U.S.C. 1324b(a)(3), or otherwise eligible to obtain the required authorizations from the U.S. Department of State. 

Apply now. Join us in building the next generation of spacecraft.