Mechanical Engineer jobs in California

Crusoe

Full-time · San Francisco, CA · $145,000 – $200,000

Crusoe seeks a mechanical engineer to manage deployment execution for their modular AI infrastructure systems across multiple sites, coordinating design, site planning, and vendor partnerships. This role suits experienced engineers comfortable bridging design and construction while supporting the scaling of data center and power systems.

Listed on Crusoe’s careers site · Apply there ↗

Relativity Space

Long Beach, CA · $129,000 – $193,000

This role leads the mechanical design and structural validation of secondary systems in a rocket's avionics package, owning everything from brackets and thermal management to isolation components. It suits an experienced mechanical engineer who thrives taking complex hardware from concept to flight while coordinating across multiple technical teams.

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

Voyager

Full-time · San Diego, CA · $110,000 – $135,000

This hands-on mechanical engineering role centers on designing and analyzing spacecraft hardware from concept through flight, with deep involvement in structural analysis, thermal modeling, and integration with electrical systems. It suits experienced engineers who want ownership of complex designs in a mission-critical space environment and can work full lifecycle from trade studies to on-orbit performance.

Listed on Voyager’s careers site · Apply there ↗

Shield AI

Full-time · Los Angeles, CA · $175,000 – $250,000 · Remote

Design and develop mechanical systems for advanced aerospace platforms from concept through field operations, owning the full product lifecycle while working hands-on with CAD, analysis, and testing. This role suits experienced mechanical engineers who thrive in fast-paced environments and enjoy collaborating across manufacturing, quality, and supply chain teams to deliver mission-critical hardware.

Listed on Shield AI’s careers site · Apply there ↗

Tempo

Full-time · San Diego, CA · $186,000 – $206,900

Tempo seeks a seasoned mechanical engineer to lead the design and development of high-temperature energy storage hardware from concept through production, with hands-on involvement in fabrication and testing. This role combines deep technical expertise in thermal and structural systems with startup agility and mentorship responsibilities.

Listed on Tempo’s careers site · Apply there ↗

Astranis

Contract · San Francisco, CA · $1,925 / week

A twelve-week salaried engineering position for recent graduates to design, build, and test satellite hardware and software alongside Astranis's full-time team. The role suits mechanical or aerospace engineers eager to work hands-on on complex systems destined for orbit.

Listed on Astranis’s careers site · Apply there ↗

AeroVironment

Full-time · Petaluma, CA · $122,500 – $187,000

This role leads mechanical design and analysis for aerospace electrical machines and packaging solutions that must survive extreme environments. It suits experienced mechanical engineers with deep expertise in rotating machinery, thermal management, and aerospace manufacturing who want to direct complex development projects.

Listed on AeroVironment’s careers site · Apply there ↗

Boeing

Full-time · El Segundo, CA · $146,200 – $197,800

This role leads electronics packaging design for space systems, combining mechanical and thermal analysis with PCB design to develop satellite components from concept through production. It suits experienced engineers who want to grow into a senior technical leadership position while contributing to space exploration projects.

Listed on Boeing’s careers site · Apply there ↗

Terran Orbital

Full-time · Irvine, CA · $105,000 – $155,000

This role leads mechanical engineering design and development for satellite systems at a space technology manufacturer, requiring deep expertise in complex spacecraft mechanics from concept through production. It suits experienced engineers who want to own significant technical responsibilities in a fast-moving aerospace environment and have hands-on involvement in hardware realization.

Listed on Terran Orbital’s careers site · Apply there ↗

Agility Robotics

Full-time · Fremont, CA · $164,000 – $213,000

Senior mechanical engineer focused on designing and prototyping electromechanical subsystems for humanoid robots deployed in real-world logistics and manufacturing environments. This role suits experienced mechanical engineers comfortable with hands-on CAD work, fabrication, testing, and cross-functional collaboration on cutting-edge robotics projects.

Listed on Agility Robotics’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

Full-time · Long Beach, CA · $90,000 – $136,000

Relativity Space is seeking a recent graduate to join their Structures and Mechanisms team, working on the design, analysis, and testing of mechanisms for their Terran R rocket—including stage separation, landing gear, and deployment systems. This role suits someone who wants hands-on hardware ownership from concept through flight, thrives in a fast-moving environment, and is comfortable collaborating across engineering disciplines to solve problems at scale.

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

Voyager

Full-time · Long Beach, CA · $120,000 – $150,000

A senior mechanical engineer will lead a team designing structural and mechanical systems for lunar spacecraft, overseeing analysis, testing, and vendor management for components that must survive extreme environments. This role suits experienced aerospace engineers who want to advance hardware for space missions and take on leadership responsibilities.

Listed on Voyager’s careers site · Apply there ↗

Astranis

San Francisco, CA · $1,925 / week

Astranis is seeking a recent mechanical engineering graduate to work on satellite hardware and software design, build, and testing for twelve weeks over summer 2027. This role offers hands-on experience with complex aerospace projects at a spaceflight company, with potential for conversion to full-time employment.

Listed on Astranis’s careers site · Apply there ↗

Agility Robotics

Full-time · Fremont, CA · $133,000 – $212,000

This role focuses on designing and developing mechanical and electro-mechanical components for the next generation of a commercial humanoid robot, working within a multidisciplinary team on systems that must operate reliably in demanding warehouse and manufacturing environments. It's suited for an engineer with 3-6 years of experience who enjoys hands-on design work, has robotics or actuator background, and wants to contribute to a product being deployed at scale.

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

Relativity Space

Long Beach, CA · $104,000 – $156,000

Design and develop structural components and assemblies for Terran R rockets, from initial concept through manufacturing support, with hands-on ownership of flight hardware. This role suits mid-level mechanical engineers who thrive in fast-paced environments and want to see their work directly impact a tangible product.

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

Astranis

San Francisco, CA · $1,925 / week

Astranis is hiring a mechanical engineer for a twelve-week paid internship-style role working on satellite hardware and software design, build, and test. This suits recent engineering graduates who want hands-on experience on real flight projects in a fast-paced environment.

Listed on Astranis’s careers site · Apply there ↗

KLA-Tencor

Full-time · Milpitas, CA · $117,800 – $200,300

KLA seeks a mechanical design engineer to develop high-precision wafer positioning and motion systems for semiconductor equipment, working with multi-functional teams to design and optimize nanometer-level accurate components. This role suits engineers experienced in precision mechanics and motion systems who want to contribute to the hardware that enables advanced semiconductor manufacturing.

Listed on KLA-Tencor’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 ↗

Relativity Space

Long Beach, CA · $132,000 – $198,000

A systems engineer role leading the design and integration of complex mechanical systems like thrust vector control for a commercial rocket program. This suits engineers with 5+ years in mechanical or electromechanical systems who want to own mission-critical hardware across full development cycles and collaborate with avionics and software teams.

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