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Principal GNC Engineer - Build the next generation reusable satellite platform! Denver, CO (Onsite) Opportunity Summary Space is entering a new phase where access to orbit must become as seamless and dependable as air travel. A stealth-mode, venture-backed startup at the forefront of this transformation is building the world's first reusable satellite platform capable of controlled reentry and redeployment. This breakthrough will reshape the economics of space missions by turning one-way deployments into two-way systems. As a Principal GNC Engineer, you'll spearhead the development of sophisticated flight control algorithms, guiding everything from orbital maneuvers to atmospheric reentry. This role combines hands-on engineering with mission-critical leadership. You'll work across simulation, embedded systems, and real-time operations to deliver end-to-end solutions that are key to unlocking scalable and sustainable access to space. About Us We're a pre-seed startup backed by top investors and led by aerospace veterans from leading commercial and government programs. Our mission is bold : enable orbit to become a two-way street by designing the first reusable satellite platform with precise return capability. With a growing team based in Denver, we operate with the speed of a startup and the rigor of a spaceflight organization, pushing the limits of what's technically possible while building real infrastructure for the space economy. Job Duties Lead the development of high-fidelity 6-DOF simulation environments and Monte Carlo test frameworks Architect and validate advanced GNC algorithms for spacecraft state estimation and control Design fault detection, isolation, and recovery (FDIR) strategies in coordination with subsystem engineers Implement sensor fusion and filtering techniques, including extended Kalman filters Deploy embedded flight software for trajectory control and attitude management Support system-level design trade studies for GNC-relevant hardware and software components Integrate and test systems in hardware-in-the-loop (HITL) environments Drive mission planning, flight ops, and CONOPs for orbital and reentry phases Collaborate with teams across avionics, propulsion, software, and mechanical engineering to deliver a flight-ready vehicle Participate in hands-on testing and validation of integrated spacecraft systems Qualifications B.S. in Aerospace Engineering, Physics, Control Systems, or a closely related discipline 8+ years of professional experience working on GNC systems for spacecraft or autonomous systems Strong command of estimation algorithms including Kalman and batch filters Proven experience with GNC algorithm development and system validation for flight applications Proficiency in Python (NumPy, SciPy), C++, and Git-based version control Experience with dynamic modeling, simulation development, and controls analysis Hands-on mindset and comfort with rapid integration and testing cycles Preferred Experience M.S. in a relevant engineering or physics field Deep knowledge of orbital mechanics and reentry trajectory planning Experience with space-based propulsion systems and vehicle navigation Background in robotic systems, autonomous guidance, or dual-use satellite programs Familiarity with embedded computing platforms and real-time flight software Prior exposure to HITL environments or mission operations workflows Security Clearance Must be able to obtain US Secret clearance. Why Join Us Be part of a transformative mission redefining space infrastructure High-impact role with influence on both product and technical direction Fast-paced, collaborative environment driven by hands-on engineering Strong opportunity for personal and career growth in a scaling company Competitive compensation with equity participation Flexible, dynamic team culture with a shared passion for spaceflight On-site role in Denver with flexibility as needed for life events Comprehensive medical, dental, and vision coverage Compensation Details 125,000 - $185,0000 + equity

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