Mechanical Engineer jobs in California

Astranis

San Francisco, CA · $1,925 / week

Astranis seeks a mechanical engineer to design, build, and test satellite hardware and software during a twelve-week winter internship-equivalent role. This is ideal for recent graduates with hands-on experience building complex electromechanical systems who want to work on hardware destined for orbit.

Listed on Astranis’s careers site · Apply there ↗

AeroVironment

Full-time · Moorpark, CA · $100,500 – $153,250

A senior mechanical engineer role developing unmanned aerial vehicle systems, from conceptual design through testing and manufacturing. This suits experienced engineers comfortable with structural analysis, electro-mechanical integration, and hands-on prototyping in a fast-paced team environment.

Listed on AeroVironment’s careers site · Apply there ↗

Boeing

Full-time · Seal Beach, CA · $182,750 – $247,250

Boeing seeks a senior mechanical engineer to lead design work on flight control systems for out-of-production commercial aircraft, ensuring safety and regulatory compliance. This role suits an aerospace professional with deep expertise in mechanical systems who can manage complex engineering projects and collaborate across multiple technical disciplines.

Listed on Boeing’s careers site · Apply there ↗

Eight Sleep

Full-time · San Francisco, CA · $160,000 – $240,000

Eight Sleep seeks a Staff Mechanical Engineer to lead the design and development of innovative electromechanical sleep fitness products from concept through high-volume manufacturing. You'll own significant technical decisions across hardware design, testing, and production ramp, working closely with cross-functional teams in a fast-paced environment committed to delivering cutting-edge consumer products.

Listed on Eight Sleep’s careers site · Apply there ↗

CesiumAstro

Full-time · El Segundo, CA · $118,000 – $142,000

A hands-on design role focused on pneumo-hydraulic valve systems for aerospace applications, reporting to leadership and mentoring other engineers. Suited for someone with CAD and simulation expertise who wants to drive technical direction in a startup environment.

Listed on CesiumAstro’s careers site · Apply there ↗

Agility Robotics

Full-time · Fremont, CA · $133,000 – $172,000

Join Agility's mechanical engineering team to design and develop the next generation of Digit humanoid robots for warehouse and manufacturing deployment. This role offers hands-on ownership of electromechanical components, from CAD design through prototyping and testing, working alongside cross-functional teams in a fast-growing robotics company.

Listed on Agility Robotics’s careers site · Apply there ↗

Relativity Space

Long Beach, CA · $132,000 – $198,000

This role involves designing and testing critical mechanisms for a commercial rocket, including stage separation systems, landing gear, and deployment mechanisms. It's suitable for experienced mechanical engineers who thrive in fast-paced hardware development and want hands-on ownership of flight-critical systems.

Listed on Relativity Space’s careers site · Apply there ↗

Astranis

Internship · San Francisco, CA · $29 / hour

A twelve-week internship designing and testing mechanical components for satellites in orbit, suited to current undergraduates in mechanical or aerospace engineering who want hands-on experience building hardware for space systems.

Listed on Astranis’s careers site · Apply there ↗

Eight Sleep

Full-time · San Francisco, CA · $140,000 – $200,000

Senior Mechanical Engineer to develop consumer sleep technology products from concept to high-volume manufacturing, working on electromechanical systems with sensors and actuators. Suits experienced hardware engineers who enjoy cross-functional collaboration and hands-on ownership in a fast-paced startup environment.

Listed on Eight Sleep’s careers site · Apply there ↗

Relativity Space

Long Beach, CA · $132,000 – $198,000

Relativity Space seeks a mechanical engineer to design and develop flight mechanisms for their Terran R rocket, including stage separation systems, landing gear, and control actuators. This role suits someone with aerospace design experience who thrives owning complex hardware projects from concept through testing and manufacturing.

Listed on Relativity Space’s careers site · Apply there ↗

Astranis

Internship · San Francisco, CA · $29 / hour

This is a 12-week summer internship for students to contribute to satellite hardware design, analysis, and integration at a commercial space company. The role suits engineering students with hands-on experience who want to work on real spacecraft components and systems heading to orbit.

Listed on Astranis’s careers site · Apply there ↗

Eight Sleep

Full-time · San Francisco, CA · $140,000 – $225,000 · Remote

This role leads mechanical design for Eight Sleep's consumer sleep technology products from concept through manufacturing ramp-up in Asia. It suits experienced engineers who want ownership of complex electromechanical systems and thrive in fast-paced, cross-functional environments.

Listed on Eight Sleep’s careers site · Apply there ↗

Relativity Space

Long Beach, CA · $132,000 – $198,000

Senior engineer guiding the design and testing of rocket mechanisms like stage separation and landing gear systems, working across structures, avionics, and manufacturing teams to deliver flight-ready hardware. Suits someone with aerospace or complex product development experience who thrives in fast-paced environments and wants hands-on ownership of critical subsystems.

Listed on Relativity Space’s careers site · Apply there ↗

Astranis

Internship · San Francisco, CA · $29 / hour

This is a twelve-week internship for engineering students to design, build, and test spacecraft hardware and mechanical systems at a satellite communications company. The role suits students pursuing degrees in mechanical or aerospace engineering who want hands-on experience with real hardware bound for orbit.

Listed on Astranis’s careers site · Apply there ↗

Relativity Space

Long Beach, CA · $150,000 – $226,000

You'll design and deliver mechanical systems for advanced avionics platforms destined for space science missions, working hands-on from concept through flight qualification. This role suits experienced aerospace engineers comfortable owning complex thermal and structural challenges in a fast-moving environment where your decisions directly shape the next generation of interplanetary exploration hardware.

Listed on Relativity Space’s careers site · Apply there ↗

Astranis

Full-time · San Francisco, CA · $110,000 – $140,000

This role involves designing, analyzing, and building mechanical systems and structural components for satellites in high orbits. It suits engineers with CAD proficiency and problem-solving skills who want hands-on work on spacecraft hardware, whether they're early in their career or have prior experience with mechanisms or composite materials.

Listed on Astranis’s careers site · Apply there ↗

Relativity Space

Long Beach, CA · $129,000 – $193,000

This role involves designing and delivering the mechanical systems that support advanced avionics platforms for space science missions, including enclosures, thermal solutions, and structural components that must survive launch and space environments. It suits an experienced mechanical engineer comfortable working hands-on in a fast-paced aerospace setting, iterating rapidly from concept through flight qualification.

Listed on Relativity Space’s careers site · Apply there ↗

Astranis

Full-time · San Francisco, CA · $145,000 – $195,000

Astranis seeks a senior mechanical engineer to own the complete design and lifecycle of spacecraft subsystems, from requirements through on-orbit operation, while mentoring junior engineers. This role suits someone with aerospace or spacecraft experience who enjoys hands-on hardware development and can lead a small team through complex engineering challenges.

Listed on Astranis’s careers site · Apply there ↗

Relativity Space

Long Beach, CA · $132,000 – $198,000

Relativity Space seeks a hands-on mechanical engineer to design, analyze, and test primary and secondary structures for their Terran R rocket, working across the full development cycle from concept through manufacturing support. This role suits someone with 5+ years of structural design experience who thrives in a fast-paced startup environment, owns projects end-to-end, and balances creative innovation with rigorous engineering discipline.

Listed on Relativity Space’s careers site · Apply there ↗

Relativity Space

Long Beach, CA · $132,000 – $198,000

This role designs structural components and assemblies for Relativity's Terran R rocket, from concept through manufacturing support, working with metals, composites, and sheet metal across all vehicle stages. It suits experienced mechanical engineers who thrive in fast-paced environments, enjoy hands-on hardware ownership, and can balance creative problem-solving with rigorous technical discipline.

Listed on Relativity Space’s careers site · Apply there ↗

Relativity Space

Long Beach, CA · $136,000 – $204,000

Lead the design and integration of rocket engine assemblies at a commercial space company, owning the complete lifecycle from layout through flight qualification. This role suits an experienced mechanical or aerospace engineer with fluid systems and structural design expertise who can mentor a small team while navigating the technical complexity of high-performance propulsion systems.

Listed on Relativity Space’s careers site · Apply there ↗

Relativity Space

Long Beach, CA · $142,000 – $214,000

This role designs the structural and mechanical systems that hold optical instruments steady through extreme temperature swings, launch forces, and orbital conditions for deep-space science missions. You'll work at the intersection of optics and mechanics, ensuring precision alignment in harsh environments that most engineers never see.

Listed on Relativity Space’s careers site · Apply there ↗

Relativity Space

Long Beach, CA · $164,000 – $246,000

You'll lead the mechanical design of rocket mechanisms like stage separation and landing gear systems, working through the complete engineering lifecycle from concept to flight test. This role suits experienced mechanical engineers who thrive in fast-paced aerospace environments and want hands-on ownership of hardware that reaches orbit.

Listed on Relativity Space’s careers site · Apply there ↗

Relativity Space

Long Beach, CA · $104,000 – $156,000

This role involves designing and testing flow control valves for rocket engines, requiring hands-on experience with thermodynamics, structures, and computational analysis tools. It suits engineers with 2+ years of experience who want to own the complete lifecycle of propulsion components from concept through flight qualification.

Listed on Relativity Space’s careers site · Apply there ↗

Relativity Space

Full-time · Long Beach, CA · $104,000 – $156,000

You'll design, build, and operate automated test systems for rocket components at a launch startup, owning complete systems from mechanical and fluid design through execution and analysis. This role suits engineers who want hands-on ownership of real hardware at a growth-stage company, without requiring prior aerospace experience.

Listed on Relativity Space’s careers site · Apply there ↗