Staff Power Electronics Engineer

Power Electronics Engineer

H3X is building America's advanced electric motor company, powering next-generation platforms in aerospace, defense, and marine. Our integrated motor drives deliver 12+ kW/kg, roughly 3x the power density of competing solutions. We're now scaling to megawatt-class systems, with customers working on everything from supersonic aircraft to turbine power generation for AI datacenters.

Our team brings together engineers and operators from aerospace, defense, and motorsports, with deep expertise in electric machines, power electronics, material science, and advanced manufacturing. We're a small, fast-moving team doing hard engineering that matters, and we're looking for people who want to do the best work of their careers alongside us.

We are looking to hire a 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.

What you will do:

• 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.

What we are looking for:

• 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.

Preferred Experience:

• Prior experience taking an inverter/power electronics product from concept to production, ideally in aerospace, automotive, or similarly rigorous environments.
• Experience with EMI/EMC standards and compliance workflows (e.g., DO-160G or similar), including design-for-compliance and lab troubleshooting.
• Experience with parasitics extraction / field solvers (e.g., Ansys Q3D) and correlating models to bench measurements.
• Familiarity with motor drive systems (PMSMs, FOC concepts) and practical integration considerations (sensing, timing, protection coordination).
• Mechanical integration awareness: packaging constraints, thermal interfaces, and collaboration with mechanical teams (Solidworks proficiency is a plus).
• Demonstrated track record of mentoring engineers and raising the bar on hardware quality, review rigor, and lab practices.

Why H3X:

Joining H3X means working on hard, meaningful problems with a skunkworks-style team that's laser-focused on building exceptional products. We're deeply vertically integrated and have a very tight design-build-test loop, which lets us move from concept to hardware at unmatched speed. We've gone from idea to shipping product in less than two months.

We're a small, highly skilled team where everyone carries real responsibility and shares an extreme ownership mentality. We stay focused on the critical path, keep bureaucracy to a minimum, and structure everything around delivering results. You'll learn and grow faster here than you would anywhere else.

You'll work alongside world-class engineers and builders who are pioneering electric motor technology at scale on some of the coolest programs in the industry, from supersonic aircraft to power generation for AI datacenters. If you want your contributions to be visible and your work to directly shape American reindustrialization, you'll feel at home here.

Compensation:

• Annual Salary Target: $140,000 - $235,000 based on experience

Benefits:

Our team provides robust benefits including medical, vision, dental, disability, & life insurance offerings, employee equity incentive program, & 401k program. Additional benefits include our gym membership stipend and outdoor recreation reimbursement program. We have an execution based culture, with flexible hours, flexible time off, 12 company holidays (including our company ski trip), monthly company events, and weekly catered team lunch on Fridays.

Our Values:

Be Relentless Never give up, persevere until the job is done. Run toward problems, not away from them. Grit is key.

Gain insight through humility Approach every challenge with a learner's mindset. Stay open to feedback, listen to others, and deepen your understanding through self-awareness. Put your ego aside and seek the truth in every discussion, especially when leading others.

Distill & Simplify Eliminate unjustified complexity and simplify wherever possible, whether in requirements, design, or execution. Use first principles thinking to distill every problem to its essence. Less is more.

Find your flow Engage fully and work with intention. Find the rhythm and deep focus that lets you do your best work. Discover your Ikigai - where your strengths, passions, and purpose meet and drive your personal fulfillment and team success. That is when the magic happens.

SEND (Solve, Evolve, Nail It, Deliver) Devise the best solution with the information at hand, test it, learn from it, and iterate quickly until you nail it. Nothing works perfectly the first time, but you should never hit the same issue twice. Stay laser-focused on solving customer problems and delivering solutions that create real value.

Equal Opportunity Employer:

H3X is an equal opportunity-affirmative action employer and considers all qualified applicants for employment based on business needs, job requirements and individual qualifications, without regard to race, color, religion, sex, age, disability, sexual orientation, gender identity or expression, marital status, past or present military service or any other status protected by the laws or regulations in the locations where we operate.