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.
H3X is looking to hire a test engineering intern this Fall to support R&D and production testing across the HPDM product line. This is not an ordinary internship- you will be given the full responsibility of a test engineer. The engineering team is intentionally small and operates at a very fast pace. A high degree of self-motivation and responsibility is required as you will be given significant freedom and will be directly responsible for your parts. We are looking to hire a full time intern with a focus on the Fall 2026 Semester for a minimum of 12 weeks, but open to extended periods as well based on candidate availability.
Responsibilities
Requirements/Concept
Establish and document requirements to fulfill testing equipment design needs
Conceptualize test equipment designs
Gather and consolidate requirements for R+D test suites in the form of test plans
Design and Analysis
Design parts and assemblies utilizing SolidWorks
Prototype and Manufacturing
Compile complete Bills of Materials
Provide technical supply chain support for sourcing hardware
Work with technicians and test engineers to build initial prototypes
Test prototype equipment for verification
Testing and Validation
Create a test plan and checklist to validate product design targets
Support testing execution and characterization of new designs
Interpret test results, identify root-cause of issues, and make design recommendations to meet the highest level of reliability and performance
Integration
Support complete system tests
Other
Identify workplace hazards and implement safe processes
Maintain testing and production equipment where necessary
Required Qualifications
Pursuing a Bachelor’s or Graduate Degree in Mechanical Engineering or similar
GPA of 3.0 or higher
Hands-on experience assembling mechanical systems
Hands-on experience with product testing
SolidWorks proficient (or similar)
Excellent written and verbal communication
Exceptional understanding of fundamentals
Action biased, results-driven mentality
Willingness to learn quickly
Preferred Qualifications
Experience with dynamometer testing
Experience with electric motors and/or inverter drives
Experience with data processing
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. They 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 their products is done in-house at their headquarters in Louisville, Colorado.
H3X’s 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. They take pride in our multidisciplinary approach, relentless dedication, high capital efficiency, and Skunkworks-style execution.
H3X has raised over $30M and has backing from top VC firms and strategic firms including Lockheed Martin, Hanwha, Y Combinator, Cubit Capital, Metaplanet, TechNexus, and Liquid 2 Ventures to deploy capital for rapid scaleup.
H3X is poised to become the world’s leading supplier of advanced electric motors by 2030 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.
Skills Required
- Pursuing a Bachelor's or Graduate Degree in Mechanical Engineering or similar
- GPA of 3.0 or higher
- Hands-on experience assembling mechanical systems
- Hands-on experience with product testing
- SolidWorks proficient (or similar)
- Excellent written and verbal communication
- Exceptional understanding of fundamentals
- Action biased, results-driven mentality
- Willingness to learn quickly
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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