NewMechanical Engineer -- Component Design, Test & Integration BlueCore EnergyMechanical Engineer -- Component Design, Test & IntegrationLong Beach, CAPhysical & Machinery Requirements: Because we are a hands-on startup, this role may require the ability to perform physical labor, navigate active construction/manufacturing zones, and/or operate heavy machinery and specialized manufacturing equipment as needed. This is a hands-on, collaborative role with room to grow — a great fit for someone eager to learn, comfortable asking questions, and happy to get their hands dirty in the lab and on the deck plate.
NewSenior Mechanical Engineer - Turbomachinery Rotordynamics Radiant IndustriesSenior Mechanical Engineer - Turbomachinery RotordynamicsEl Segundo, CA$158,000–$219,450 / yearRadiant is seeking a highly motivated Senior Mechanical Engineer, Turbomachinery (Rotordynamics) to join the team responsible for the power generation and primary cooling turbomachinery of our Kaleidos product. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases.
NewMechanical Engineer EPC STAFF Acquisition and Development, LLCMechanical EngineerLos Angeles, CA$80,000–$160,000 / yearCreate construction drawings for the project owner, coordination and communication between the design team and the client/ customer, provide project management oversight, and support throughout the entire construction process. • HVAC design (airside, hydronic, steam) for a wide variety of multi-disciplinary (A&E) project types.
NewOpto-Mechanical Engineer (Analysis) Impulse SpaceOpto-Mechanical Engineer (Analysis)Redondo Beach, CAThis position requires applicants to be either U.S. Persons (i.e., U.S. citizen, U.S. national, lawful permanent U.S. resident (green card holder), an individual granted asylum in the U.S., or an individual admitted in U.S. refugee status) or persons eligible to obtain an export license from the U.S. Departments of State, Commerce, or other applicable U.S. government agencies. Support Structural-Thermal-Optical Performance analysis by working with optical engineers to understand alignment sensitivity, detector placement tolerances, boresight stability, wavefront error, and pointing requirements.
NewMechanical Engineer, Factory Automation Hadrian AutomationMechanical Engineer, Factory AutomationLos Angeles, CA$130,000–$220,000 / yearBacked by leading investors including JPMorgan Chase, Valor Equity Partners, Andreessen Horowitz, Founders Fund, 137 Ventures, Lux Capital, T. Rowe Price, and Morgan Stanley, we’re building the future of American manufacturing—and looking for exceptional people to help make it happen. Series D at a $7.87B valuation, Hadrian is rapidly expanding our manufacturing footprint, launching new capabilities across welding, casting, forging, electronics, additive manufacturing, and more, while scaling our Factory-as-a-Service platform to transform how critical products are built.
NewSenior Mechanical Engineer (Terran-R Structures) Relativity SpaceSenior Mechanical Engineer (Terran-R Structures)Long Beach, CA$132,000–$198,000 / yearAny unsolicited submission - via email, our website, social media, or directly to an employee - will be deemed the property of Relativity Space, and no fee will be owed absent a current, fully executed agreement with Talent Acquisition that specifically authorizes submissions for the applicable role. Whether you're working on highly iterative mechanisms that move or tight-margin structures that shouldn't, you'll get hands-on hardware ownership and see the rocket coming to life on the factory floor.
NewSenior Mechanical Engineer - Structures Radiant IndustriesSenior Mechanical Engineer - StructuresEl Segundo, CA$133.50–$184.80 / hourPerform detailed thermomechanical analysis (static strength, durability/fatigue) and dynamic analysis (vibration, shock) to determine structural integrity (margins of safety) using both hand calculations and finite element tools. Portable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases.
NewSenior Mechanical Engineer, Mechanisms Radiant IndustriesSenior Mechanical Engineer, MechanismsEl Segundo, CA$133.50–$184.80 / hourPortable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Perform detailed thermomechanical analysis (static strength, durability/fatigue) and kinematic analysis to determine structural integrity and performance margins using both hand calculations and finite element tools.
NewMechanical Engineer, Fluid Systems - 2026 New Graduate Radiant IndustriesMechanical Engineer, Fluid Systems - 2026 New GraduateEl Segundo, CA$105,000–$125,000 / yearPortable nuclear power with rapid-deploy capability can replace similar-sized diesel generators and provide critical asset support for hospitals, data centers, remote sites, and military bases. Radiant’s unique, practical approach to nuclear development leverages modern software engineering to rapidly deliver safe, factory-built microreactors that use existing, well-qualified materials.
NewSenior Satellite Mechanical Engineer, Optical Structures K2 SpaceSenior Satellite Mechanical Engineer, Optical StructuresLos Angeles, CA$140,000–$175,000 / yearIn this role, you will have cradle-to-grave ownership over the mechanical elements of space environment payloads including optical payloads, with a focus on broader mechanical skills – including but not limited to structural design for stress and modal performance; design for optimal manufacturing; design of lens and optical component mounting solutions that can perform in launch and space environments; thermal analysis and mitigation; and cradle-to-grave ownership from clean-sheet trades, design, analysis, testing, and integration support. Backed by $450M from leading investors including Altimeter Capital, Redpoint Ventures, T. Rowe Price, Lightspeed Venture Partners, Alpine Space Ventures, and others – with an additional $500M in signed contracts across commercial and US government customers – we're mass-producing the highest-power satellite platforms ever built for missions from LEO to deep space.
NewSenior Satellite Mechanical Engineer (Structures) K2 SpaceSenior Satellite Mechanical Engineer (Structures)Los Angeles, CA$140,000–$175,000 / yearBacked by $450M from leading investors including Altimeter Capital, Redpoint Ventures, T. Rowe Price, Lightspeed Venture Partners, Alpine Space Ventures, and others – with an additional $500M in signed contracts across commercial and US government customers – we're mass-producing the highest-power satellite platforms ever built for missions from LEO to deep space. In your first 6 months, you will define mechanical requirements, create initial concepts and trades, perform preliminary and detailed analysis, define development test campaigns, trade and select any purchased electromechanical subsystems, and produce development hardware.
NewSatellite Mechanical Engineer K2 SpaceSatellite Mechanical EngineerLos Angeles, CA$90,000–$140,000 / yearBacked by $450M from leading investors including Altimeter Capital, Redpoint Ventures, T. Rowe Price, Lightspeed Venture Partners, Alpine Space Ventures, and others – with an additional $500M in signed contracts across commercial and US government customers – we're mass-producing the highest-power satellite platforms ever built for missions from LEO to deep space. Demonstrated ability to own mechanical hardware or systems within an integrated engineering team outside a classroom setting (High Power Rocketry, CubeSats, Robotics Competitions, Formula SAE and Baja SAE, Engineers without Borders, Design-Build-Fly, NASA student launch, personal entrepreneurial ventures, etc.).
NewPrincipal Mechanical Engineer K2 SpacePrincipal Mechanical EngineerLos Angeles, CA$185,000–$200,000 / yearBacked by $450M from leading investors including Altimeter Capital, Redpoint Ventures, T. Rowe Price, Lightspeed Venture Partners, Alpine Space Ventures, and others – with an additional $500M in signed contracts across commercial and US government customers – we're mass-producing the highest-power satellite platforms ever built for missions from LEO to deep space. In your first 6 months, you will define mechanical requirements, create initial concepts and trades, perform preliminary and detailed analysis, define development test campaigns, trade and select any purchased electromechanical subsystems, and produce development hardware.
NewSenior Electro-Mechanical / CAE Engineer - Aerospace Manufacturing ALIGN Executive SearchSenior Electro-Mechanical / CAE Engineer - Aerospace ManufacturingCity of Industry, CAThe engineer will convert operating conditions—including angled/off-center ULD loading, drive torque, loaded retraction, jams, and stop impacts—into defensible analyses, correlated tests, and practical design improvements. The role combines electro-mechanical product engineering with simulation-based assessment of motors, gears, shafts, bearings, rollers, planetary drives, cams, cables, housings, and mechanical stops.
NewLead Mechanical Engineer, Structures AstrolabLead Mechanical Engineer, StructuresHawthorne, CAWe are singularly focused on designing, building, and operating a fleet of multi-purpose commercial planetary rovers to extend and enhance humanity’s presence in the solar system. Experience mentoring and developing more junior engineers, contractors, and interns to build an effective design team.
NewMechanical Design Engineer - Advanced Electrochemical Systems Approach VentureMechanical Design Engineer - Advanced Electrochemical SystemsLos Angeles, CA$130,000–$180,000 / yearOur multidisciplinary engineering team is developing integrated propulsion, power, and fluid systems that enable more capable spacecraft while solving complex engineering challenges through rapid design, testing, and iteration. Join a seed-stage space technology startup developing advanced spacecraft propulsion and energy systems that enable the next generation of in-space mobility.
NewMechanical Design Engineer - Advanced Spacecraft Propulsion Approach VentureMechanical Design Engineer - Advanced Spacecraft PropulsionHawthorne, CA$130,000–$180,000 / yearYou will design precision mechanical components, perform structural and thermal analysis, build and test hardware, and work closely with multidisciplinary engineering teams to deliver reliable propulsion systems capable of operating in demanding space environments. Our team combines experience from leading aerospace organizations with the agility of a venture-backed startup, creating an environment where engineers have significant ownership, move quickly, and directly influence product development from concept through flight.
NewOpto-Mechanical Build Engineer FreeformOpto-Mechanical Build EngineerLos Angeles, CA$90,000–$200,000 / yearIn addition to the significant stock option package, the estimated salary range for this role is $90,000-$200,000, dependent on the candidate's academic level (Bachelors, Masters, or PhD) and demonstrated out of classroom experience. Job Description OPTO-MECHANICAL BUILD ENGINEER Freeform builds AI-native manufacturing systems that unify software, hardware, and physics to produce industrial-scale parts at the speed of human ideation.
NewMechanical Engineer HermeusMechanical EngineerLos Angeles, CAFinal compensation will be determined based on a variety of factors, including role scope and responsibilities, relevant experience, education and training, key skills, market data, and business needs. Job Description Hermeus is a venture-backed defense aviation company reclaiming the lost art of rapid iterative prototyping to build the fastest aircraft in the world today.
NewSenior Mechanical Engineer Turion SpaceSenior Mechanical EngineerIrvine, CATo conform to U.S. Government export regulations, applicant must be a (i) U.S. citizen or national, (ii) U.S. lawful, permanent resident (aka green card holder), (iii) Refugee under 8 U.S.C. § 1157, or (iv) Asylee under 8 U.S.C. § 1158, or be eligible to obtain the required authorizations from the U.S. Department of State. Industry Experience: Extensive experience working in aerospace or space technology sectors, including understanding of the unique requirements and challenges associated with mechanical systems for space missions.