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.