Mechanical Engineer jobs in California
61 open roles classified as Mechanical Engineer and placed in California, read from employers’ own careers sites.
Lead, Launch Mechanical Engineering
Relativity Space
Long Beach, CA · $128,000 – $192,000
Lead a small team of mechanical engineers designing and building launch facility systems for Relativity's Terran R rocket, blending hands-on technical work with mentorship and team growth. This role suits experienced test or launch engineers ready to take on leadership while staying involved in complex mechanical design and integration.
Listed on Relativity Space’s careers site · Apply there ↗
Senior Mechanical Engineer
Relativity Space
2 locations · $124,000 – $186,000
Relativity Space seeks a senior engineer to design, test, and optimize propulsion systems and test infrastructure for their Terran R orbital rocket at their Stennis facility. This role suits someone with mechanical or aerospace engineering credentials who enjoys hands-on problem-solving in a fast-paced environment building hardware for active spaceflight operations.
Listed on Relativity Space’s careers site · Apply there ↗
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Staff Mechanical Engineer, Tooling
Relativity Space
Long Beach, CA · $143,000 – $215,000
A mechanical engineer designing and developing tooling and automation systems that enable rocket and engine manufacturing at scale. This role suits experienced tooling designers comfortable with full-project ownership in a fast-paced aerospace production environment.
Listed on Relativity Space’s careers site · Apply there ↗
Principal Mechanical Engineer, Tooling
Relativity Space
Long Beach, CA · $185,000 – $277,000
This role designs and oversees the development of manufacturing tools, fixtures, and factory automation equipment for rocket production at scale. It suits experienced mechanical engineers who thrive in fast-paced environments and can manage complex projects from concept through commissioning while collaborating closely with manufacturing and design teams.
Listed on Relativity Space’s careers site · Apply there ↗
Senior Mechanical Engineer, Tooling
Relativity Space
Long Beach, CA · $122,000 – $182,000
Relativity Space is seeking a mechanical engineer to design and develop tooling, fixtures, and factory automation equipment for their Terran R rocket manufacturing facility. This role suits experienced engineers who thrive on solving novel production challenges and want to see their designs directly impact rocket manufacturing at scale.
Listed on Relativity Space’s careers site · Apply there ↗
Staff Propulsion Engineer, Engine Assembly Design
Relativity Space
Long Beach, CA · $164,000 – $246,000
This role leads the design and integration of rocket engines for a commercial launch vehicle, owning everything from initial layouts through production qualification. It suits experienced propulsion engineers ready to take ownership of complex systems across multiple configurations while mentoring junior team members.
Listed on Relativity Space’s careers site · Apply there ↗
Senior Propulsion Engineer, Engine Assembly Design
Relativity Space
Long Beach, CA · $132,000 – $198,000
This role leads the overall layout, integration, and configuration management of liquid rocket engines for a commercial launch vehicle, working across propulsion subsystems to optimize design for manufacturability and flight performance. It suits engineers with 5+ years in fluid systems or structural design who want ownership of complex hardware from concept through production.
Listed on Relativity Space’s careers site · Apply there ↗
Senior Launch Mechanical Engineer
Relativity Space
Long Beach, CA · $124,000 – $170,500
Relativity Space seeks a mechanical engineer to develop structural, fluid, and system designs for their Terran R launch vehicle, working at the Cape where all vehicle systems integrate and launch operations occur. This role suits someone with 5+ years of experience in mechanical design and structural analysis who wants hands-on ownership of launch vehicle hardware and interfaces.
Listed on Relativity Space’s careers site · Apply there ↗
Staff Mechanical Engineer, Factory Automation
Relativity Space
Long Beach, CA · $143,000 – $215,000
Relativity Space seeks a mechanical engineer to design and develop manufacturing tools, fixtures, and factory automation equipment for rocket production. This role suits someone with substantial experience in tooling design who thrives solving novel problems in a fast-paced manufacturing environment.
Listed on Relativity Space’s careers site · Apply there ↗
Senior Mechanical Engineer, Factory Automation
Relativity Space
Long Beach, CA · $122,000 – $182,000
You'll design and develop tooling, fixtures, and factory automation equipment that directly enables the production of Terran R rockets. This role suits experienced mechanical engineers who thrive in fast-paced environments, enjoy solving novel manufacturing challenges, and want to see their designs built and used on the factory floor within weeks rather than months.
Listed on Relativity Space’s careers site · Apply there ↗
Principal Mechanical Engineer, Factory Automation
Relativity Space
Long Beach, CA · $185,000 – $277,000
This role leads the design and development of manufacturing tooling and factory automation equipment for rocket production, combining structural fixtures, assembly systems, and automated processes. It suits experienced mechanical engineers who thrive in fast-paced environments, enjoy solving novel production challenges, and want to see their designs directly impact manufacturing scale and efficiency.
Listed on Relativity Space’s careers site · Apply there ↗
Mechanical Engineer jobs in other states
Other roles hiring in California
Reports on Mechanical Engineer hiring
- New Roles Fall 20% to 6,948, With Only Indiana and Minnesota AddingOct 31, 2026
- Engineering Manager Posted Pay Slips to $233,750, Down 8.3% From the Prior 30 DaysOct 31, 2026
- 18,599 Roles Opened and 8,090 Closed This Week, With Michigan Nearly TriplingOct 24, 2026
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