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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 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. What you will do: 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 What we are looking for: - 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. 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 prod