Mechanical Engineering Intern - Summer 2025

Louisville, CO
Internship
Student (College)

JOB PURPOSE:

At H3X, we are building the most advanced electric propulsion systems in the world to enable sustainable electric aircraft. 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 aircraft. We have several power classes of motors ranging from 30kW to 3MW and are selling to several markets including aviation, aerospace and defense, marine, and specialized ground vehicles.

About the Role: H3X is looking to hire Mechanical Engineering Interns for Summer 2025 to support the prototype development across all aspects of our integrated motor drives. This is not an ordinary internship. You will be given the full responsibility of a mechanical 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.
 

Key Responsibilities 

  • Identify root cause of failures.
  • Establish requirements for given sub-system.
  • Compile & source Bill of Materials for responsible sub-systems.
  • Conduct PDRs & CDRs for responsible sub-systems.
  • Design parts & assemblies utilizing SolidWorks.
  • Perform tolerance stack-ups and convey via GD&T in engineering drawings.
  • Create build instructions for responsible sub-systems.
  • Create Design Validation Plan and Report (DVP&R) for sub-systems.
  • Execute testing and characterization of responsible sub-system.
  • Post process test results, identify root-cause of potential new issues and make design recommendations to meet the highest level of reliability and performance.
  • Integrate sub-system into full system.
  • Support future production builds or complete system test.
  • Identify workplace hazards and implement safe processes.
  • Maintain testing and production equipment where necessary.
     

Required Responsibilities 

  • Pursuing a Bachelor’s or Graduate Degree in Mechanical Engineering or similar.
  • GPA of 3.0 or higher.
  • Hands-on experience assembling mechanical systems.
  • 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 manufacturing processes (machining, Metal AM, & composites)
  • Experience with producing 2D part drawings & GD&T
  • Experience with linear structural FEA
     

Pay Range: $22-$32/hr USD
 

Company Benefits

  • Gym membership stipend
  • Flexible hours (deliverable-based goals)
  • Flexible-time off (just need manager approval)
  • Relocation package
  • Company laptop
    ​​​​​​​

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. H3X takes pride in their multidisciplinary approach, relentless dedication, high capital efficiency, and Skunkworks-style execution. 

H3X has raised over $30M with backing from top VC firms and strategic firms, including Lockheed Martin, Hanwha, Y Combinator, Cubit Capital, Metaplanet, TechNexus, and Liquid 2 Ventures. 

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.

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