Senior Mechanical Engineer Jobs in Long Beach, California

58 open Senior Mechanical Engineer jobs in Long Beach, California at 4 companies, including Vast, Rocket Lab and Relativity Space. Updated daily from company career pages.

Vast

Vast offers decision-making tools that help and support customers in purchasing homes, cars, and vacations.

Lead Manufacturing Engineer, Propulsion Long Beach, California · $136,120 - $193,224 USD
Lead Manufacturing Engineer, Thermal Control Systems Long Beach, California · $120,000 - $194,000 USD
Senior Solar Array Engineer, Mechanical Long Beach, California · $112,340 - $230,472 USD
Avionics Mechanical Design Engineer Long Beach, California · $137,760 - $265,392 USD
Senior Test Engineer, Thermal Control Systems Long Beach, California · $137,760 - $195,552 USD

8 more open roles at Vast

Rocket Lab

Rocket Lab delivers a range of complete rocket systems and technologies for fast and low-cost payload deployment.

Senior Structural Analyst I Long Beach, California · $115,200 - $172,800 USD
Supplier Quality Engineer (I, II, Senior I, Senior II) - Mechanical Long Beach, California · $70,000 - $171,600 USD
Senior Spacecraft Thermal Engineer II Long Beach, California · $164,500 - $255,275 USD
Senior Spacecraft Thermal Engineer I Long Beach, California · $115,200 - $158,400 USD
Senior Mechanical Development & Test Engineer II Long Beach, California · $132,000 - $198,000 USD

8 more open roles at Rocket Lab

Relativity Space

Relativity Space is an aerospace company that designs, develops, and builds 3D printed rockets.

Senior Mechanical Integration Engineer Long Beach, California · $129,000 - $193,000 USD
Senior Manufacturing Engineer, Turbomachinery Long Beach, California · $122,000 - $182,000 USD
Sr Manufacturing Engineer, Structures Long Beach, California · $122,000 - $182,000 USD
Senior Propulsion Structural Analyst, Integrated Design Long Beach, California · $132,000 - $198,000 USD
Sr Manufacturing Engineer, Paint and TPS Long Beach, California · $122,000 - $182,000 USD

19 more open roles at Relativity Space

True Anomaly

True Anomaly develops space security technologies using AI, software, and spacecraft to enhance global security and sustainability.

Senior Mechanical Engineer, Spacecraft Long Beach, California · $135,000 - $200,000 USD
Mechanical Test Engineer (II-Senior) Long Beach, California · $140,000 - $175,000 USD
Mechanical Engineer, Tooling and MGSE (II-III) Long Beach, California · $90,000 - $165,000 USD
Spacecraft Mechanical Production Engineer (II-III) Long Beach, California · $95,000 - $165,000 USD
Mechanical Engineer, Spacecraft (II-III) Long Beach, California · $90,000 - $165,000 USD

3 more open roles at True Anomaly

Updated 2026-10-11.