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At Heart Aerospace we develop the ES-30, a regional hybrid-electric airplane with a capacity of 30 passengers, an electric zero-emission range of 200 km and an extended hybrid range of 400 km. Heart is targeting type certification of the ES-30 by the end of the decade. Your Mission We are seeking a Propulsion Engineer to join our Dynamic Propulsion team in Torrance, CA. You will lead the testing, validation and certification of the aircraft’s hybrid-electric powertrain system. You will also interface across mechanical, thermal, propulsion, actuation, avionics, and battery teams to develop, execute, and analyze integrated system-level tests of the Electric Propulsion Unit (EPU) and its subsystems. Key responsibilities include but are not limited to: • Lead and execute system-level powertrain testing, including electric motor, inverter, gearbox, disconnect systems, and propeller subsystems. • Design and commission hybrid-electric propulsion test stands, HIL, and Digital Twin, including instrumentation, safety systems, control systems, and data acquisition. • Plan, execute, and document test campaigns to verify performance, safety, and certification compliance. • Collaborate with cross-functional teams to develop test procedures and test plans for integrated propulsion systems. • Coordinate with suppliers and external labs to support component and system-level testing. • Analyze test data, prepare reports, and provide feedback to design teams for iterative development. • Support environmental, endurance, fault-injection, and compliance testing for certification readiness. You'll Bring These Qualifications: • 2+ years of professional experience in powertrain, propulsion, or test engineering, with electric or ideally hybrid-electric systems. • Hands-on experience designing and operating powertrain or propulsion test stands with complex instrumentation and control. • Deep understanding of electric powertrains including motors, inverters, batteries, and thermal management systems. • Proficiency with data acquisition systems (e.g., dSPACE, NI, Dewesoft) and instrumentation (current/voltage sensors, thermocouples, strain gauges). • Experience developing automated test procedures and control scripts (e.g., Python, LabVIEW, or similar). • Strong analytical skills in interpreting test data and diagnosing system performance and failure modes. • Understanding of high voltage safety standards and procedures for testing environments. These Qualifications Would Be Nice to Have: • Familiarity with aerospace certification requirements (EASA CS-23/25 or FAA FAR Part 23/25). • Experience with DO-160 or MIL-STD environmental test standards. • Experience with root cause analysis and tools such as DFMEA and fault tree analysis. • Background in hybrid propulsion systems or aerospace propulsion integration. Education: • Bachelor’s or Master’s degree in Mechanical, Electrical, Aerospace Engineering, or related fields. Base Pay Range: $124,000 — $216,000 USD