Senior​/Power Electronics Engineer

About the Role

At H3X, we are building the most advanced electric motors in the world for sustainable aviation, marine, industrial, and defense applications. At 12 kW/kg continuous, the HPDM family of integrated motor drives is a step change in electric propulsion technology and removes one of the main barriers blocking widespread proliferation of electric and hybrid aircraft. Our motors range in size from 30 kW to 30 MW, include integrated drives, and are 3X lighter than competitors’ systems.

We are looking to hire a Senior or Staff Power Electronics Engineer who will oversee inverter development, taking the design from prototype to production for a next generation product line. The ideal candidate has experience in the entire product development cycle including requirements definition, design and analysis, and test and validation. You will be a key part of the core engineering team and will have a direct impact on the trajectory of the company.

• Own the power electronics hardware for high power density integrated motor drives, from requirements → concept → prototype → production readiness.

• Translate product requirements into inverter flowdown requirements (performance, safety, reliability, manufacturability, testability).

• Lead schematic design and high-density PCB layout (Altium), including stack-up, creepage/clearance strategy, high-current power paths, and gate-drive layout.

• Design and optimize wide-bandgap power stages (SiC and/or GaN): switching behavior, gate drive, protection, sensing, isolation, and thermal/packaging constraints.

• Engineer for low parasitics (power loop inductance, gate loop inductance, current sense fidelity) using simulation and measurement; apply tools like Ansys Q3D (or equivalent) where useful.

• Develop and validate designs using circuit and system simulation (LTSpice / PLECS / MATLAB/Simulink or equivalent).

• Drive EMI/EMC design and debug: grounding strategy, filtering (CMCs, Y-caps, etc.), shielding approaches, and layout practices; partner with test teams through pre-compliance and compliance efforts.

• Build and execute hardware test and characterization plans (DVP R): DPT, thermal, fault response, transient behavior (and more) across the operating envelope.

• Be the “go‑to” for debugging: efficiently isolate root cause across electrical/mechanical/firmware interfaces and implement corrective actions (design changes, manufacturing improvements, etc).

• Partner with Supply Chain / Manufacturing on DFM/DFT, PCB fab/assembly coordination, inverter BOM ownership, and sustaining support through prototype builds.

• Collaborate with motor control team to ensure clean interfaces (sensing, protection, comms, timing), and support integrated system bring-up in the lab.

• 5+ years professional experience in power electronics hardware, with scope appropriate for Senior or Staff level ownership.

• M.S./Ph.D. in Electrical Engineering or equivalent experience

• Deep hands‑on experience with high‑density PCB layout for power electronics (Altium strongly preferred): disciplined component placement, current return paths, loop minimization, and mixed‑signal best practices.

• Demonstrated experience with wide‑bandgap devices (SiC and/or GaN) and their practical design implications (gate drive, dv/dt, di/dt, protection, layout sensitivity), as well as high‑voltage, high‑current constraints: isolation strategy, creepage/clearance, partial discharge, etc.

• Excellent debugging and bring‑up skills: can take a new inverter from “first power” to stable operation; comfortable with oscilloscopes/differential probes, current probes, impedance considerations, and safe high‑power lab practices.

• Proficiency in at least two of:
  Altium, LTSpice/PLECS, MATLAB/Simulink, and comfort learning new tools quickly.

• Strong fundamentals in power conversion, magnetics basics, sensing/isolation, protection, and control interface requirements for inverter systems.

• Ability to write clear technical documentation (requirements, schematics/layout notes, test plans, validation reports) and communicate crisply across disciplines.

• Prior experience taking an inverter/power electronics…