Power Electronics Intern

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.