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Louisville, Colorado, United States
Onsite
About H3X Technologies
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.
About the role
H3X is looking to hire a test engineering intern this 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 for a full time Spring Intern, but also have availability for Summer 2027 and extended Co-Op positions.
What you will do:
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
What we are looking for:
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
Nice to Have Experience:
Experience with dynamometer testing
Experience with electric motors and/or inverter drives
Experience with data processing
Compensation & Benefits
Salary/Hourly Compensation Range: $23 - $37/hr based on school level & experience
Flexible hours (deliverable-based goals)
Relocation package
Monthly company events
Friday Team Lunches
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.
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.