Principal Mechanical Engineer Jobs in California

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Principal Mechanical Engineer (Military Electronics)

Jobot

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Gardena, California, USA

Full-time

Do you haver experienced with designing of rugged electro-mechanical systems form cradle to grave? If so take a closer look! This Jobot Job is hosted by: Jenner Wiggins Are you a fit? Easy Apply now by clicking the "Apply Now" button and sending us your resume. Salary: $150,000 - $190,000 per year A bit about us: We are a defense technology company specializing in solid-state, software-defined directed energy systems designed to counter unmanned aircraft systems and optimize power efficiency
Posted 1 day ago | Updated moments ago

Principal Mechanical Engineer, Site Services

Genentech, Inc.

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South San Francisco, California, USA

Full-time

Job DescriptionResponsibilities: The responsibilities for this position may include, but are not limited to: \nUnder the direction of the Director of Design Engineering, the Design Engineering Principal Mechanical Engineer provides technical leadership and accountability for mechanical engineering designs on capital projects and engineering services performed at the South San Francisco site and other sites where SSF Design & Construction (D&C) has active projects.\nThis role engages actively in
Posted 31 days ago | Updated 2 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 5 days ago | Updated 3 hours ago

Principal Mechanical Engineer

ASML USA

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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

Principal Engineer - Mechanical Engineering (Hybrid)

RTX Corporation

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Remote or Windsor, Connecticut, USA

Full-time

Date Posted: 2025-07-16 Country: United States of America Location: 02: Building 02 Windsor Locks One Hamilton Road, Windsor Locks, CT, 06096 USA Position Role Type: Hybrid U.S. Citizen, U.S. Person, or Immigration Status Requirements: Security Clearance: None/Not Required Looking to make an impact in engineering? Join our Hydro-Mechanical, Actuation & Pneumatic Valve Design Group as a Mechanical Design Engineer. You'll play a key role in developing innovative solutions for critical component
Posted 5 days ago | Updated 3 hours ago

Principal Mechanical Project Engineer - Hybrid

Johnson Controls, Inc.

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Remote or York, Pennsylvania, USA

Full-time

Hybrid work opportunity - Consideration given to applicants within a commutable distance from York, PA. or must be willing to relocate. Build your best future with the Johnson Controls team! Who We Are: As a global leader in smart, healthy and sustainable buildings, our mission is to reimagine the performance of buildings to serve people, places and the planet. Join a winning team that enables you to build your best future! Our teams are uniquely positioned to support a multitude of industries
Posted 10 days ago | Updated 3 hours ago

Principal Mechanical Design Engineer, Tooling

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 44 days ago | Updated 3 hours ago

Principal Mechanical Design Engineer, Factory Automation

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 44 days ago | Updated 3 hours ago

Principal Mechanical Design Engineer (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 53 days ago | Updated 3 hours ago

Sr. Principal Thermal, Automation and Mechanical Engineer

Marvell Semiconductor Inc.

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Westlake Village, California, USA

Full-time

About Marvell Marvell's semiconductor solutions are the essential building blocks of the data infrastructure that connects our world. Across enterprise, cloud and AI, automotive, and carrier architectures, our innovative technology is enabling new possibilities. At Marvell, you can affect the arc of individual lives, lift the trajectory of entire industries, and fuel the transformative potential of tomorrow. For those looking to make their mark on purposeful and enduring innovation, above and be
Posted 1 day ago | Updated 3 hours ago

Staff Mechanical Engineer R&D

Johnson & Johnson

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Remote or Santa Clara, California, USA

Part-time

At Johnson & Johnson, we believe health is everything. Our strength in healthcare innovation empowers us to build a world where complex diseases are prevented, treated, and cured, where treatments are smarter and less invasive, and solutions are personal. Through our expertise in Innovative Medicine and MedTech, we are uniquely positioned to innovate across the full spectrum of healthcare solutions today to deliver the breakthroughs of tomorrow, and profoundly impact health for humanity. Learn m
Posted 2 days ago | Updated 3 hours ago

Staff Mechanical Engineer, Precision Motion Control

10x Genomics

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Pleasanton, California, USA

Full-time

About The Role We are seeking an expert and thought leader to join our Hardware Engineering group as a Staff Mechanical Engineer. This role is focused on the mastery of precision motion control, requiring deep, hands-on expertise in control systems theory and servo tuning to achieve nano-scale resolution for our next-generation instruments. You will take on full leadership of critical projects, guiding the development of cutting-edge mechanical technologies. You will have significant influence
Posted 3 hours ago

Staff Mechanical Engineer, Test Infrastructure

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 8 days ago | Updated 3 hours ago

Lead Mechanical Engineer 1 - Nuclear

Sargent & Lundy LLC.

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Remote

Full-time

Description You will be involved in nuclear power plant systems design, including preparation or review of: Modification packages for operating nuclear power plantsFunctional mechanical drawings and/or drawings for nuclear power plant systemsEngineering analyses and evaluations to support modifications and operation of plant systemsTechnical specifications and procurement documents for plant equipmentVendor bid evaluations for plant equipmentStudies and options evaluations for modifications to
Posted 5 days ago | Updated 3 hours ago

Lead Mechanical Engineer 2 - Government Services

Sargent & Lundy LLC.

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Remote

Full-time

Description This is a remote position with the expectation of frequent travel to a client site near Oak Ridge, Tennessee. This is a mid-level design engineering position that offers a variety of challenging opportunities in Mechanical Engineering and will provide an excellent opportunity for career advancement: Lead Mechanical design engineering efforts on a multi-disciplined project design team and apply mechanical engineering expertise to the design and analysis of special purpose equipment,
Posted 8 days ago | Updated 3 hours ago

Lead Mechanical Engineer 2 - Government Services

Sargent & Lundy LLC.

•

Remote or Oak Ridge, Tennessee, USA

Full-time

Description This is a remote position with the expectation of frequent travel to a client site near Oak Ridge, Tennessee. This is a mid-level design engineering position that offers a variety of challenging opportunities in Mechanical Engineering and will provide an excellent opportunity for career advancement: Lead Mechanical design engineering efforts on a multi-disciplined project design team and apply mechanical engineering expertise to the design and analysis of special purpose equipment,
Posted 15 days ago | Updated 3 hours ago

Lead Mechanical Engineer 1 (Power Uprates) - Nuclear

Sargent & Lundy LLC.

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Remote

Full-time

Description Our electric power generation clients are seeking to increase the power output of their existing power plants to meet the electric demands. This is expanding work in the nuclear industry. You will work on major systems, equipment and plant process in the following areas: Perform consulting level work for power uprates in the nuclear industry.Interface with clients and project teams to present technical discussions and project status.Develop engineering proposals and cost estimates.M
Posted 17 days ago | Updated 3 hours ago

Lead or Senior HVAC Mechanical Engineer

Kforce Technology Staffing

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Sacramento, California, USA

Full-time

RESPONSIBILITIES: Kforce has a client that is seeking a Lead or Senior HVAC Mechanical Engineer in Sacramento, CA. Responsibilities: * Lead project planning, coordination, and execution with minimal oversight * Independently manage conceptual design to construction drawing development for multiple small and medium-sized projects * Develop designs compliant with Building Codes, Energy Codes, and LEED standards * Handle HVAC calculations, design, and layout of equipment, duct, and piping systems
Posted 10 days ago | Updated 1 hour ago

Staff Mechanical Engineer - R&D Robotics

Johnson & Johnson

•

Remote or Santa Clara, California, USA

Full-time

At Johnson & Johnson, we believe health is everything. Our strength in healthcare innovation empowers us to build a world where complex diseases are prevented, treated, and cured, where treatments are smarter and less invasive, and solutions are personal. Through our expertise in Innovative Medicine and MedTech, we are uniquely positioned to innovate across the full spectrum of healthcare solutions today to deliver the breakthroughs of tomorrow, and profoundly impact health for humanity. Learn m
Posted 50 days ago | Updated 3 hours ago

Lead Mechanical Engineering (Mechanical Engineer, Staff)

Redwire Space

•

San Jose, California, USA

Full-time

The Lead Mechanical Engineer will help guide Mechanical Engineers that support design, FEM/FEA, development, fabrication, and testing of multiple space vehicles and subsystems. You will assist with and support proposals for new spacecraft designs and development of sub-assemblies that comply with diverse launch and mission requirements. Work in this group includes include system-level architecture definition for compliance with mission requirements including a wide variety of operational dynamic
Posted 40 days ago | Updated 3 hours ago