Senior Engineer (Engineer III) / Principal Engineer (Engineer IV) - Propulsion

Senior Engineer III / Principal Engineer IV – Propulsion SystemsQuantum 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 an experienced Senior Engineer III / Principal Engineer IV – Propulsion Systems to lead the development of advanced flight-qualified propellant tanks and spacecraft propulsion systems supporting next-generation Ranger missions. In this role, you will provide technical leadership across the full product lifecycle—from architecture and concept development through design, manufacturing, qualification, integration, and flight operations.Depending on your experience and technical expertise, you will serve as the technical lead for either propellant tank development or spacecraft propulsion subsystem development, driving innovation across chemical and electric propulsion technologies. This position is ideal for an engineer who thrives in a fast-paced environment, enjoys solving complex technical challenges, and is passionate about delivering flight-ready hardware for demanding national security, civil, and commercial space missions.You'll Make an ImpactLead the development of advanced propellant tanks or spacecraft propulsion systems from concept through flight qualification and mission operationsProvide technical leadership across design, analysis, manufacturing, testing, integration, qualification, and flight support activitiesLead multidisciplinary engineering teams to deliver mission-critical hardware on schedule and within program objectivesServe as the technical authority for propulsion system architecture, subsystem design, and component developmentConduct propulsion trade studies and system architecture evaluations to optimize spacecraft performance, reliability, and operational flexibilityDrive technical program execution, risk reduction strategies, development planning, and long-range technology roadmapsSupport customer engagements, executive program reviews, technical interchange meetings, and design reviewsMentor and develop engineers across multiple disciplines while promoting technical excellence and engineering best practicesLead resolution of complex technical and programmatic issues throughout the spacecraft development lifecycleContribute to continuous improvement initiatives that strengthen propulsion engineering processes, technical standards, and organizational capabilitiesWhat It TakesSenior Engineer IIIBachelor's, Master's, or Ph.D. in Aerospace Engineering, Mechanical Engineering, or a related technical discipline7+ years of relevant aerospace or propulsion engineering experienceDemonstrated ability to lead engineering teams through major project milestonesExperience leading low- to medium-complexity propulsion or spacecraft development effortsRecognized technical contributor with strong engineering judgment and decision-making skillsExperience managing technical schedules, program execution, and engineering prioritiesPrincipal Engineer IVBachelor's, Master's, or Ph.D. in Aerospace Engineering, Mechanical Engineering, or a related technical discipline10+ years of relevant aerospace or propulsion engineering experienceDemonstrated success leading multidisciplinary engineering teams through complex spacecraft development programsEstablished technical leadership across medium- to high-complexity engineering effortsRecognized subject matter expert with experience influencing technical direction across programs or organizationsExperience managing technical schedules, budgets, and program executionTechnical ExpertiseCandidates should possess demonstrated expertise in one or more of the following areas:Propellant Tank DevelopmentDesign, analysis, fabrication, testing, and integration of spacecraft propellant tanksPressure vessel design standards, structural qualification, and range safety compliancePropellant management techniques for microgravity environments, including slosh dynamicsTank fabrication and welding processes, including weld evaluation and quality assuranceSpacecraft Propulsion SystemsDesign, analysis, fabrication, integration, testing, and operation of spacecraft propulsion systemsSpacecraft pressure systems, propulsion architecture, and range safety requirementsIntegration of propulsion systems with spacecraft avionics, structures, thermal, power, and mission systemsChemical and electric propulsion technologies, propulsion components, and spacecraft propulsion architecturesAssembly, Integration, and Test (AI&T) activities supporting spacecraft propulsion subsystem verification and vehicle integrationNice-to-Have Experience3+ years leading engineering teams developing spacecraft propulsion systems or propellant tanksExperience supporting fast-paced aerospace, defense, or commercial space programsSystems engineering experience including requirements development, interface management, verification, and validation planningExperience applying Lean Six Sigma, project management methodologies, or continuous improvement practicesExperience utilizing AI-enabled engineering, modeling, or design optimization toolsExperience leading rapid hardware development programs from prototype through flight qualificationBroad spacecraft systems knowledge beyond propulsion, including power, structures, avionics, thermal, or GNCSubject matter expertise in spacecraft propulsion components such as valves, regulators, thrusters, pressure vessels, feed systems, or fluid control devicesWhat You'll GetOwnership – Lead the development of mission-critical spacecraft propulsion systems and propellant tanks supporting advanced Ranger missionsInnovation – Help develop next-generation propulsion technologies enabling agile, high-mobility space operationsImpact – Deliver flight-ready propulsion hardware supporting national security, civil, and commercial space missionsGrowth – Join a multidisciplinary engineering team where you'll influence spacecraft architecture, propulsion technology, and mission executionCompensation – Competitive salary, equity, and comprehensive benefits including medical, dental, vision, generous leave, HSA, 401(k) matching, and equity participationBase Salary: $160,000–$230,000The salary range for this role is an estimate based on a wide range of compensation factors. Actual salary offer may vary based on (but not limited to) work experience, education and/or training, technical expertise, leadership experience, critical skills, and business considerations. Position level (Senior Engineer III or Principal Engineer IV) will be determined based on the selected candidate's qualifications and experience. Highly competitive equity grants and sign-on opportunities may be available and are considered part of Quantum Space's total compensation package.Additional RequirementsTo comply with U.S. Government space technology export regulations, including ITAR, applicants must be a U.S. citizen, lawful permanent resident, protected individual per 8 U.S.C. §1324b(a)(3), or eligible to obtain the required authorizations from the U.S. Department of State.Apply now. Join us in building the next generation of spacecraft.