Test Engineer - Plasma Diagnostics

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 highly motivated Test Engineer with relevant professional experience or academic training related to plasma sources, devices, and diagnostics. The ideal candidate has a strong background in plasma physics and diagnostic techniques, including instrumentation, hands-on hardware implementation and test execution, and data analysis and interpretation. You will work in a fast-paced, high-performance environment, collaborating across engineering R&D, test, analysis, and hardware manufacturing teams to advance next-generation propulsion products and rapidly deliver flight-ready hardware. This role requires strong proficiency in experimental plasma physics, as well as the ability to work in a fast-paced R&D environment. Previous experience or a strong interest in propulsion systems (electric, fluid, chemical) is a plus. Where You’ll Make an Impact Lead experimental development and characterization of electric propulsion devices, such as Hall Effect Thrusters and RF Thrusters Design, implement, and operate plasma diagnostic systems including Langmuir probes, emissive probes, retarding potential analyzers, and optical diagnostics Analyze and interpret experimental data to support and validate existing analytical and computational models Develop test plans and execute hot-fire test campaigns in vacuum chamber environments Documents test results and contribute to technical reports, proposals, and publications Support thruster and propulsion system design and build iterations What It Takes B.S. in Physics, Aerospace, Electrical Engineering, Mechanical Engineering or related discipline (M.S. or Ph.D. preferred) 3+ years of experience with plasma physics diagnostics (relevant to electric propulsion and/or RF plasmas preferred) Strong proficiency with instrumentation, experimental methods, and data analysis Solid understanding of plasma physics and propulsion systems Programming skills in Python, MATLAB, or similar for data analysis Hands-on experience with high-vacuum chamber testing Ability to design and troubleshoot experimental hardware Strong technical writing and communication skills Proven ability to work in a fast-paced, hands-on environment Nice-to-Have Experience Experience with characterizing RF plasmas sources or electric propulsion (e.g., Hall Effect Thruster) discharge plumes Hands-on experience with spacecraft propulsion system design, build, integration, and flight qualification Knowledge of manufacturing methods (machining, composites, additive manufacturing) Experience working with NASA and/or DoD programs What You’ll Get Innovation – The opportunity to develop and test next-generation spacecraft propulsion systems. Impact – See your work directly enable mission success. Growth – Opportunities for technical leadership in a fast-growing space company. Compensation – Competitive salary, equity, and top-tier benefits including medical, dental, vision, generous leave, HSA, 401(k) matching, and equity sharing. Location: Hawthorne, CA Compensation: $120,000 to $180,000 Annual Salary Depending on Experience 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 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.