Senior/Staff Mechanical Design Engineer

H3X Technologies; Louisville (CO); On-site; USD 135,000 - 200,000; Full time

Benefits offered by this job

Annual salary target

Employee equity incentive plan

Health insurance

Gym membership stipend

Outdoor Recreation Reimbursement

Flexible hours

Flexible time off

Relocation package

Monthly company events

401k program

Job summary

A technology firm specializing in advanced electric motors is seeking a Mechanical Design Engineer to conceptualize and design innovative products for sustainable aviation and marine applications. The role involves substantial design freedom, collaboration with multi-disciplinary teams, and hands-on prototyping of electric motor systems. Candidates should possess a Mechanical Engineering degree and relevant experience with CAD software, particularly SolidWorks. The position offers an annual salary target of $135,000–$200,000, equity incentives, and a supportive work culture focused on innovation.

Qualifications

• 6+ years of CAD software experience, preferably SolidWorks.
• 6+ years’ experience with producing 2D part drawings & GD&T.
• Familiarity with thermal and modal analysis preferred.

Responsibilities

• Establish and document requirements for new designs.
• Design parts and assemblies utilizing SolidWorks.
• Compile complete Bills of Materials for prototypes.

Skills

CAD software experience

Strong communication skills

Attention to detail

Ability to collaborate

Problem-solving mindset

Education

Bachelor’s or Graduate Degree in Mechanical Engineering

Tools

SolidWorks

ANSYS

Job description

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.

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 manufacturing engineers to build initial prototypes

Testing and Validation

• 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

Integration

• Integrate sub-systems into full systems

• Support future production builds or complete system tests

Other

• Identify workplace hazards and implement safe processes

• Maintain testing and production equipment where necessary

Required Qualifications

• Bachelor’s or Graduate Degree in Mechanical Engineering or similar.

• Hands‑on experience assembling mechanical systems.

• 6+ years of CAD software experience (SolidWorks preferred).

• 6+ 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.

Benefits & Compensation

• Annual Salary Target $135,000- $200,000 based on experience (Senior to Staff level)

• Employee equity incentive plan

• Health insurance: medical, vision, dental, ST & LT disability, and life

• Gym membership stipend (up to $60/month)

• Outdoor Recreation Reimbursement ($900 annual maximum)

• Flexible hours (deliverable-based goals)

• Flexible time off (just need manager approval)

• Relocation package

• Monthly company events

• 401k program

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.