Mechanical Engineer Jobs in California

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Principal Mechanical Engineer

ASML USA

•

San Diego, California, USA

Full-time

Introduction to the role ASML US, including its affiliates and subsidiaries, bring together the most creative minds in science and technology to develop lithography machines that are key to producing faster, cheaper, more energy-efficient microchips. We design, develop, integrate, market and service these advanced machines, which enable our customers - the world's leading chipmakers - to reduce the size and increase the functionality of their microchips, which in turn leads to smaller, more pow
Posted 60+ days ago | Updated 3 hours ago

Senior Staff Mechanical Engineer - Harness Design (San Diego)

Shield AI Inc

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San Diego, California, USA

Full-time

Founded in 2015, Shield AI is a venture-backed defense technology company with the mission of protecting service members and civilians with intelligent systems. Its products include the V-BAT aircraft, Hivemind Enterprise, and the Hivemind Vision product lines. With offices in San Diego, Dallas, Washington, D.C., Boston, Abu Dhabi (UAE), Kyiv (Ukraine), and Melbourne (Australia), Shield AI's technology actively supports U.S. and allied operations worldwide. For more information, visit Follow Sh
Posted 52 days ago | Updated 3 hours ago

Senior Mechanical Engineer - Education, Living, Retail

Arcadis

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Los Angeles, California, USA

Full-time

Arcadis is the world's leading company delivering sustainable design, engineering, and consultancy solutions for natural and built assets. We are more than 36,000 people, in over 70 countries, dedicated to improving quality of life. Everyone has an important role to play. With the power of many curious minds, together we can solve the world's most complex challenges and deliver more impact together. Role description: Arcadis is seeking a Senior Mechanical Engineer to join our Design & Enginee
Posted 60+ days ago | Updated 3 hours ago

Mechanical Engineer II

Relativity Space

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Long Beach, California, USA

Full-time

At Relativity Space, we're building rockets to serve today's needs and tomorrow's breakthroughs. Our Terran R vehicle will deliver customer payloads to orbit, meeting the growing demand for launch capacity. But that's just the start. Achieving commercial success with Terran R will unlock new opportunities to advance science, exploration, and innovation, pioneering progress that reaches beyond the known. Joining Relativity means becoming part of something where autonomy, ownership, and impact ex
Posted 60+ days ago | Updated 3 hours ago

Principal Mechanical Engineer - Fullerton, CA (On-site)

RTX Corporation

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Fullerton, California, USA

Full-time

Date Posted: 2025-07-18 Country: United States of America Location: CA531: Fullerton, CA Bldg 676 1801 West Hughes Drive Building 676, Fullerton, CA, 92834 USA Position Role Type: Onsite U.S. Citizen, U.S. Person, or Immigration Status Requirements: The ability to obtain and maintain a U.S. government issued security clearance is required.Security Clearance: DoD Clearance: Secret At Raytheon, the foundation of everything we do is rooted in our values and a higher calling - to help our nation
Posted 4 days ago | Updated 3 hours ago

Mechanical Engineer

GEI Consultants, Inc.

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Pasadena, California, USA

Full-time

Description Your role at GEI. GEI's Mechanical engineering group needs staff to support its growing client base and is seeking an associate to senior level Mechanical Engineer. This is an excellent opportunity for a highly motivated individual to join our team. The successful candidate must have excellent academic credentials and a strong desire to work on a broad range of small to larger size projects related to water resources from planning to final design, construction engineering support, a
Posted 60+ days ago | Updated 3 hours ago

Mechanical Engineer - Therma

Legence Therma LLC

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San Jose, California, USA

Full-time

Therma, a Legence company For over 50 years, Therma has continued to redefine the mechanical construction landscapes in California. Renowned for outstanding client service and attention to detail, we balance innovative, facility-specific solutions with a pragmatic, cost-conscious approach. Today, the firm employs more than 1,100 people in 3 regional offices, and its clients represent a diverse range of market sectors, including Biopharmaceutical, Education, Healthcare, Food & Beverage, Commerci
Posted 2 days ago | Updated 3 hours ago

Senior Thermal Mechanical Engineer

PsiQuantum

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Palo Alto, California, USA

Full-time

Quantum computing holds the promise of humanity's mastery over the natural world, but only if we can build a real quantum computer. PsiQuantum is on a mission to build the first real, useful quantum computers, capable of delivering the world-changing applications that the technology has long promised. We know that means we will need to build a system with roughly 1 million qubits that supports fault tolerant error correction within a scalable architecture, and a data center footprint. By harnes
Posted 60+ days ago | Updated 3 hours ago

Staff Mechanical Engineer, Fluid & Air Systems

Form Energy

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Berkeley, California, USA

Full-time

Are you ready to build America's energy future? Form Energy is an American manufacturing and energy technology company. We're revolutionizing energy storage with cost-effective, multi-day technology designed to keep the electric grid secure and reliable, even during extended periods of stress. By strengthening the electric system and reimagining what's possible, we're giving clean energy a whole new form! In recent years, Form Energy has earned a number of accolades, including being named by TIM
Posted 60+ days ago | Updated 3 hours ago

Senior Mechanical Engineer - Therma

Legence Therma LLC

•

San Jose, California, USA

Full-time

Therma, a Legence company For over 50 years, Therma has continued to redefine the mechanical construction landscapes in California. Renowned for outstanding client service and attention to detail, we balance innovative, facility-specific solutions with a pragmatic, cost-conscious approach. Today, the firm employs more than 1,100 people in 3 regional offices, and its clients represent a diverse range of market sectors, including Biopharmaceutical, Education, Healthcare, Food & Beverage, Commerci
Posted 2 days ago | Updated 3 hours ago

Staff Mechanical Engineer, Plastics Design

Form Energy

•

Berkeley, California, USA

Full-time

Are you ready to build America's energy future? Form Energy is an American manufacturing and energy technology company. We're revolutionizing energy storage with cost-effective, multi-day technology designed to keep the electric grid secure and reliable, even during extended periods of stress. By strengthening the electric system and reimagining what's possible, we're giving clean energy a whole new form! In recent years, Form Energy has earned a number of accolades, including being named by TIM
Posted 60+ days ago | Updated 3 hours ago

Senior Mechanical Engineer - Wastewater

Parsons Services Company

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Fountain Valley, California, USA

Full-time

In a world of possibilities, pursue one with endless opportunities. Imagine Next! When it comes to what you want in your career, if you can imagine it, you can do it at Parsons. Imagine a career working with exceptional people sharing a common quest. Imagine a workplace where you can be yourself. Where you can thrive. Where you can find your next, right now. We've got what you're looking for. Job Description: Join Our Team: Principal Mechanical Engineer - Water Group Location: Pasadena, CA (w
Posted 60+ days ago | Updated 3 hours ago

Senior Mechanical Engineer (Hybrid-Puerto Rico)

RTX Corporation

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Remote or Aguadilla, Aguadilla, Puerto Rico

Full-time

Date Posted: 2025-06-05 Country: United States of America Location: HPR01: Collins Puerto Rico- Aguadilla Road 110 North Km 28.8 San Antonio Industrial Park, Aguadilla, PR, 00603 USA Position Role Type: Hybrid U.S. Citizen, U.S. Person, or Immigration Status Requirements: Security Clearance: None/Not Required Collins Aerospace is looking to hire a Senior Mechanical Engineer to perform design cost management. The primary focus of this position will be to provide Design to Cost (DTC) support for
Posted 39 days ago | Updated 3 hours ago

Sr. Mechanical Engineer - Healthcare - P2S

Legence Therma LLC

•

Irvine, California, USA

Full-time

P2S stands as a provider of professional engineering services to a broad range of markets, including higher education, healthcare, ports/harbors, industrial, entertainment, commercial, laboratories, municipal, and federal sectors. Our specialties include electrical, mechanical, plumbing, fire protection, and technology integration. Our offered services range from engineering and commissioning to construction management. With over 300 dedicated employees, P2S is an internationally recognized lead
Posted 2 days ago | Updated 3 hours ago

Mechanical Engineer Intern

Parker Hannifin

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Irvine, California, USA

Full-time

Org Marketing Statement At Parker Aerospace, we develop technologies and innovative solutions that enable reliable, efficient and increasingly sustainable flight for the lifecycle of the aircraft, including aftermarket support. Our passionate people with deep engineering expertise, together with our breadth of differentiated technologies, ensure that we make the extraordinary happen and continue to shape the future of aviation in partnership with our customers. As a member of our team, you are
Posted 24 days ago | Updated 3 hours ago

Senior Mechanical Engineer - Energy Solutions - CMTA

Legence Therma LLC

•

Los Angeles, California, USA

Full-time

CMTA, a Legence company CMTA is one of the fastest growing engineering firms in the U.S. with nationally recognized expertise in sustainable, high performance building engineering. We are a collaborative, competitive, innovative, and energetic group of engineers and team leaders who incorporate a holistic approach towards consulting engineering, performance contracting, and zero energy projects. We focus on finding engineers whose personalities lead them to excellence, and we provide exceptiona
Posted 10 days ago | Updated 3 hours ago

Sr. Mechanical Engineer

Katalyst Healthcares and Lifesciences

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San Jose, California, USA

Full-time

Responsibilities: Perform 3D modelling, detailing, and Mechanical design of electromechanical, power generation, and distribution products. Should have a strong knowledge of various material properties and use, fabrication methods (Sheetmetal & Machined Parts, surface coatings, finishes, adhesives, lubricants, and enclosure environmental sealing. Design and develop bus bar systems & wiring layouts for electrical distribution and power management while maintaining adherence to the applicable s
Posted 37 days ago | Updated 3 hours ago

Senior Mechanical Engineer

HDR, Inc.

•

Walnut Creek, California, USA

Full-time

At HDR, our employee-owners are fully engaged in creating a welcoming environment where each of us is valued and respected, a place where everyone is empowered to bring their authentic selves and novel ideas to work every day. As we foster a culture of inclusion throughout our company and within our communities, we constantly ask ourselves: What is our impact on the world? Watch Our Story:' ' Each and every role throughout our organization makes a difference in our ability to change the world f
Posted 49 days ago | Updated 3 hours ago

Mechanical Engineer

HDR, Inc.

•

Folsom, California, USA

Full-time

At HDR, our employee-owners are fully engaged in creating a welcoming environment where each of us is valued and respected, a place where everyone is empowered to bring their authentic selves and novel ideas to work every day. As we foster a culture of inclusion throughout our company and within our communities, we constantly ask ourselves: What is our impact on the world? Watch Our Story:' ' Each and every role throughout our organization makes a difference in our ability to change the world f
Posted 60+ days ago | Updated 3 hours ago

Building Mechanical Engineer

HDR, Inc.

•

Irvine, California, USA

Full-time

At HDR, our employee-owners are fully engaged in creating a welcoming environment where each of us is valued and respected, a place where everyone is empowered to bring their authentic selves and novel ideas to work every day. As we foster a culture of inclusion throughout our company and within our communities, we constantly ask ourselves: What is our impact on the world? Watch Our Story:' ' Each and every role throughout our organization makes a difference in our ability to change the world f
Posted 60+ days ago | Updated 3 hours ago