Mechanical Engineer III - Spacecraft Programs

Quantum Space is redefining mobility and autonomy beyond Earth orbit. Our Ranger spacecraft deliver high delta-V and sustained on-orbit maneuverability, enabling missions across cislunar and geostationary space that were previously out of reach. We are building the vehicles, infrastructure, and operational expertise that connect and protect assets across the Earth–Moon system.Who We’re Looking ForWe are seeking a Mechanical Engineer III to lead the design and development of electric propulsion hardware and associated subsystems, from concept through flight.This role is intended for an experienced engineer who can own propulsion-related hardware, drive design decisions, and deliver flight-ready systems. You will operate at the intersection of mechanical design, thermal management, and high-performance hardware development, working closely with propulsion, systems, and test teams.Where You’ll Make an ImpactOwn mechanical design of electric propulsion subsystems (thruster assemblies, structural interfaces, feed systems, thermal management hardware)Lead architecture and packaging trades for propulsion integrationDevelop and release high-quality CAD models and drawings with full GD&TPerform and guide structural and thermal analysis (including high-temperature and vacuum environments)Drive integration and testing of propulsion systems, including anomaly resolution and root cause analysisDefine and execute verification strategies (analysis, inspection, test)Lead design reviews (PDR/CDR) and communicate technical decisions clearlyCoordinate with suppliers and manufacturing partners for precision and high-performance componentsMentor junior engineers and elevate team technical capabilityEnsure designs meet performance, manufacturability, and reliability requirementsWhat It TakesBS or MS in Mechanical Engineering or related field5–10+ years of experience developing hardware, preferably in high-performance aerospace systemsStrong proficiency in Creo (or similar CAD) and drawing release processesDeep understanding of GD&T (ASME Y14.5)Experience owning hardware through full lifecycle (design → build → test → qualification/flight)Strong background in structural and thermal analysisProven ability to lead technical efforts and drive decisionsStrong troubleshooting and root cause analysis capabilityAbility to work on-site in the LA areaNice-to-Have ExperienceDirect experience with electric propulsion systemsFamiliarity with plasma environments and material selection for EP systemsExperience with thermal management in high-power-density systemsProficiency with FEA tools (ANSYS, Nastran, etc.)Experience with environmental testing (TVAC, vibration, life testing)Familiarity with PLM systems (Windchill or similar)What You’ll GetOwnership – Lead development of critical propulsion hardwareTechnical Depth – Work on cutting-edge electric propulsion systemsLeadership – Mentor engineers and influence system architectureCompensation – Competitive salary, equity, and comprehensive benefitsLocation:Compensation: $125,000 to $155,000 Annual Salary Depending on ExperienceAdditional 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 required authorizations.