Job Purpose:
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 and are 3X lighter than competitors’ systems.
As a Power Electronics Intern at H3X Technologies, you will contribute to the design, testing, and validation of breakthrough power electronic systems for next-generation electric propulsion. You will work alongside experienced engineers, gaining hands-on experience with high-voltage systems and the manufacturing processes that take ideas from concept to production. We are open to hiring interns in 3 month, 6 month, or longer internships, in different time periods based on availability.
Key Responsibilities
Assist in the design, simulation, and testing of power electronic hardware
Support the development and validation of PCB assemblies and wire harnesses, collaborating with engineering and manufacturing teams to implement new processes
Conduct simulations and performance analyses using industry-standard tools (MATLAB, LTspice, Simulink) to validate system performance and identify optimization opportunities
Participate in troubleshooting and root cause analysis for hardware issues, assisting in implementing corrective actions and documenting outcomes
Assist with test setup, measurement, and evaluation of prototypes and production units, including high-voltage system operation under lab safety guidelines
Contribute to technical documentation, including test reports and manufacturing instructions for PCB and wire harness assemblies
Stay updated on latest trends and advancements in power electronics
Required Qualifications
Working toward a Bachelor’s or Master’s degree in Electrical Engineering, Computer Engineering, or a closely related field
Strong electronics fundamentals and project-based electronics experiences
Strong written and verbal communication skills
Organized with attention to detail
Experience or interest in high-voltage systems, power electronics, electric motors
Curious and motivated by first principles
Preferred Qualifications
Coursework or experience in power electronics principles—including converter topologies, semiconductor devices, etc.
Familiarity with PCB design tools (Altium preferred)
Experience in simulation tools such as MATLAB, LTspice, Simulink, or similar
Hands-on experience with circuit prototyping and troubleshooting; comfort with lab instruments and small hand tools
Experience with scripting and/or software development (Python, C, etc.)
Benefits & Compensation
$23.00 - $37.00 / hr based on school level & experience
Relocation stipend
Monthly company events
Friday Team Lunch
THE COMPANY:
H3X Technologies is a U.S.-based manufacturer of electric motors for sustainable aviation, marine, industrial, and defense applications. We have developed a family of integrated motor drives that can scale in power from 30kW to 30MW with power densities as high as 12 kW/kg and best-in-class efficiency. This high performance is enabled by novel scalable core technology and proprietary manufacturing processes for motor stacking, winding, and assembly. The design, manufacturing, and testing of our products is done in-house at our headquarters in Louisville, Colorado.
Our world-class team is composed of experts from Tesla, SpaceX, GE Aviation, and Siemens with deep knowledge in electric machines, power electronics, material science, control systems, and advanced manufacturing. We take pride in our multidisciplinary approach, relentless dedication, high capital efficiency, and Skunkworks-style execution.
We have raised over $30M and are backed by top venture capital and strategic investors, including Lockheed Martin, Hanwha, Y Combinator, Cubit Capital, Metaplanet, TechNexus, Liquid 2 Ventures, and Soma Capital, enabling rapid scaleup.
Our mission is to become the world leader in advanced electric motors to drive deep decarbonization in aviation, marine, and heavy industrial applications and unlock next-generation electrified defense technology to strengthen national security.
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.
Top Skills
What We Do
H3X manufactures the world's most power-dense integrated motor drives (IMDs) ranging from 30kW to 3MW for aerospace, defense, marine, and heavy industry. From the sea to the sky, our products unlock major benefits for weight-sensitive, volume-constrained, and high power applications.
At the core of our organization are principles that guide every action and decision we make. These values define our story, our problem-solving approach, and are the foundation for how we operate as a company.
Be Relentless
At the core of our organization are principles that guide every action and decision we make. These values define our story, our problem-solving approach, and are the foundation for how we operate as a company.
Gain insight through humility
Approach every challenge with a learner’s mindset. Be open to feedback, listen to others, and deepen your understanding through self-awareness. Put your ego aside and always seek truth in discussion with others. This is particularly crucial for effective leadership.
Distill & Simplify
Eliminate unjustified complexity and simplify wherever possible, whether in requirements, design, or execution. This applies to communication and decision-making as well. Use first principles thinking and distill each facet of a problem to its essence. Less is more.
Find your flow
Engage fully and work with intention, finding the rhythm and deep focus that leads to doing your best work. Discover your Ikigai - where your strengths, passions, and purpose drive both personal fulfillment and team success. When you're "in the zone", 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, iterate quickly, and then nail it. Don't expect it to work perfectly the first time, but you should never encounter the same issue twice. Laser-focus on solving customer problems and deliver solutions that provide real value for them.
Why Work With Us
H3X is a skunkworks-style team laser-focused on building exceptional products through advanced engineering, vertical integration, and lightning-fast execution. We’ve assembled a world-class team of engineers and builders from SpaceX, Tesla, Anduril, and beyond. You’ll be surrounded by people who push you to do the best work of your life.
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