Mechanical Design Engineer

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, include integrated drives, and are 3X lighter than competitors’ systems.

H3X also leverages the HPDM platform in integrated systems such as the HPDG-30 hybrid power plant and the HPDM-90S submersible units. These offerings extend the performance, efficiency, and reliability of the HPDM family into new markets like marine and UAV’s.

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 Skunk works - small, highly technical, and very fast. All mechanical design engineers are given significant design freedom and will be directly responsible for flight-critical parts.

• Establish and document requirements
• Conceptualize designs and product architectures that meet program requirements
• Present in Concept Design Reviews

• Design parts and assemblies utilizing Solid Works
• 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

• Compile complete Bills of Materials
• Provide technical supply chain support for sourcing hardware
• Work with technicians and manufacturing engineers to build initial prototypes

• Create a Design Validation Plan and Report (DVP&R) for new products and/or subsystems
• 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

• Integrate sub‑systems into full systems
• Support future production builds or complete system tests

• Identify workplace hazards and implement safe processes
• Maintain testing and production equipment where necessary

• Bachelor’s or Graduate Degree in Mechanical Engineering or similar.
• Hands‑on experience assembling mechanical systems.
• 3+ years of CAD software experience (Solid Works preferred).
• 3+ years’ experience with producing 2D part drawings & GD&T.
• Experience with static structural FEA (ANSYS preferred) (Familiarity with thermal and modal analysis preferred).
• Excellent written and verbal communicator to effectively share knowledge and build the collective mindshare of the company.
• Fundamentally curious and motivated by first principles.
• Organized and obsessive attention to detail: no room for oversight when designing flight critical systems.
• Action biased, results oriented mentality.
• Humble and open minded: willingness to accept feedback and learn, consistently improve upon yourself and the product for which you will be responsible.
• A high degree of emotional intelligence: ability to collaborate closely with coworkers in a respectful and empathetic manner.

• Annual Salary Target $90,000 - $180,000 based on experience (Associate to Staff level)
• Employee equity incentive plan
• Health insurance: medical, vision, dental, ST & LT disability, and life
• Gym membership stipend (up to $60/month)
• Epic or IKON Ski/Snowboard Pass (up to $869 provided)
• Flexible hours (deliverable-based goals)
• Flexible time off (just need manager approval)
• Relocation package
• Monthly company events
• 401k program

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…