Staff Engineer - GNC/ADCS

About IonQ: IonQ, Inc . [NYSE: IONQ] is the world’s leading quantum platform and merchant supplier - delivering integrated quantum solutions across computing, networking, sensing, and security. IonQ’s newest generation of quantum computers, the IonQ Tempo, is the latest in a line of cutting-edge systems that have been helping customers and partners including Amazon Web Services, and AstraZeneca achieve 20x performance results and accelerate innovation in drug discovery, materials science, financial modeling, logistics, cybersecurity, and defense. In 2025, the company achieved 99.99% two-qubit gate fidelity, setting a world record in quantum computing performance . Headquartered in College Park, Maryland, IonQ has operations in California, Colorado, Massachusetts, Tennessee, Washington, Italy, South Korea, Sweden, Switzerland, Canada, and the United Kingdom. Our quantum computing services are available through all major cloud providers, while we also meet the needs of networking and sensing customers across land, sea, air, and space. IonQ is making quantum platforms more accessible and impactful than ever before. About Capella Capella, an IonQ company, spans national security, advanced sensing, and next-generation compute to deliver secure, mission-ready intelligence. Capella’s culture is built on collaboration, rigorous engineering, and a shared commitment to delivering solutions that strengthen global stability and security. Team members work side-by-side with some of the most innovative minds in space systems, quantum-enabled technologies, and mission-critical operations. Capella values curiosity, resilience, and a willingness to tackle hard problems with precision and creativity. Capella welcomes and encourages applicants whose perspectives are historically underrepresented in technology, national security, and aerospace. No prior space experience is required. Diverse viewpoints strengthen Capella’s ability to innovate and deliver meaningful impact for partners worldwide. Location: This role is based on site at our Louisville, Colorado office, with the option to work two days a week remotely. Travel: Up to 5%, domestic or international. Job ID: 1658 The Role As a Staff Guidance, Navigation, and Controls (GNC) Engineer, you will be responsible for the full lifecycle of the Attitude Determination and Control Systems (ADCS) and Propulsion subsystems for a constellation of radar imaging spacecraft and future quantum space missions. You will serve as a cognizant engineer for GNC hardware and software. You will work closely with a multidisciplinary team of engineers to ensure existing spacecraft meet their mission objectives and to design and develop next- generation systems. Your work will have a direct impact on spacecraft performance and the overall technical success of Capella. This role sits in the Spacecraft Engineering organization, alongside systems, thermal, electrical/harnessing, mechanical/deployables, radar/communications, and flight software engineers. Responsibilities Drive the full lifecycle for ADCS and Propulsion systems supporting a constellation of spacecraft: design, build, test, on-orbit operations, and decommissioning. Generate and own ADCS and Propulsion systems performance requirements to satisfy high-level mission objectives. Lead research and development for new spacecraft subsystems, working from first principles to develop and execute complex trade studies, conduct system sizing and design, and present at program-level design reviews. Be a technical authority on control theory. Design and implement state estimators and control algorithms for the localization and pointing of cutting-edge quantum missions and radar-imaging spacecraft. Develop custom software tools to automate engineering workflows, support design studies, and enhance spacecraft on-orbit operational efficiency. Build high fidelity software simulations to model spacecraft dynamics and system behavior. Act as a subject matter expert for all