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Senior/Staff Mechanical Design Engineer

H3X Technologies - Louisville, Colorado | OnSite

Posted Jun 10, 2026

Benefits

Parental leave
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Non-birth-parent leave
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Family-building benefits
  • Fertility benefits: Not verified
  • Adoption assistance: Not verified
  • Surrogacy assistance: Not verified
Mental health support
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Relocation assistance
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Childcare support
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Learning budget
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Verification
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Salary
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401(k) match
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Market context

U.S. role benchmark (BLS OEWS)
$116,543 U.S. median for this role
Projected growth (BLS Employment Projections)
+9.8% - Much faster than average

Matched to SOC 15-1252 - Software Engineering aggregate by role bucket.

Source: U.S. Bureau of Labor Statistics, OEWS, May 2024 and Employment Projections, 2024-2034.

Role

Role function
Engineering From the posting source checked Jun 20, 2026
Seniority
Senior From the posting source checked Jun 20, 2026
Work mode
Hybrid From the posting source checked Jun 20, 2026
In-office days
2 days From the posting source checked Jun 20, 2026

Schedule

Shift type
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Weekend work
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Company

Company stage
Growth-stage From the posting source checked Jun 20, 2026

Application

Cover letter
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Assessment
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Deadline
Not stated

Where they hire

State eligibility is not yet verified.

About this role

Senior/Staff Mechanical Design Engineer Louisville, Colorado | OnSite About the Role At H3X https://www.h3x.tech/, 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. Mechanical design engineers are responsible for bringing new designs to life from clean sheet concept generation through early prototype testing. Mechanical Design Engineers will work with highly interdisciplinary teams to bring H3X products to life. The engineering team operates like Skunkworks - small, highly technical, and very fast. All mechanical design engineers are given significant design freedom and will be directly responsible for flight-critical parts. Responsibilities Requirements/Concept - Establish and document requirements - Conceptualize designs and product architectures that meet program requirements - Present in Concept Design Reviews Design and Analysis - Design parts and assemblies utilizing SolidWorks - Perform and document mechanical analyses, including hand calculations, FEA, CFD, etc. for structural, modal, thermal, and/or fluid aspects of products - Present in Preliminary and Critical Design Reviews - Generate engineering drawings per ASME and GD&T standards, perform tolerance stack-ups Prototype and Manufacturing - Compile complete Bills of Materials - Provide technical supply chain support for sourcing hardware - Work with technicians and

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