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Senior Mechanical Design Engineer

Inertia

Livermore, California, United States permanent

Posted: March 13, 2026

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Quick Summary

Design and develop ultra-high energy pulsed laser systems for fusion energy, working closely with cross-functional teams

Job Description

Overview:

We are seeking a Senior Mechanical Design Engineer within the laser division, to play a key role in developing the next generation of ultra-high energy pulsed laser systems for fusion energy. Typical design projects would include the design and development of solid-state laser hardware and systems, large-aperture opto-mechanical mounts and positioning systems, support structures, vacuum chambers and systems, thermal management systems, and test stands and diagnostics.

Primary Responsibilities:

• Gather and develop requirements for systems with stakeholders across all disciplines

• Conceptualize system architectures and concepts based on high-level requirements

• Lead small teams in the design of precision mechanical and opto-mechanical equipment and systems for IFE facilities

• Design mechanical, opto-mechanical, and electro-mechanical equipment and systems

• Validate design work with appropriate analysis (static and modal FEA, hand calculations, etc.)

• Present at design reviews to science and management stakeholders

• Work closely with other disciplines in the design and coordination of activities

• Integrate precision opto-mechanical, fluidic, and electrical hardware, designed both in-house and by subcontractors, into large-scale CAD assemblies that include facility BIM data

• Perform detailed component materials and finish specifications, manage technical data transfer to suppliers, inspect and qualify hardware following procurement

• Assemble prototype hardware; develop and execute test plans for subsystem performance validation

• Utilize large-scale CAD assemblies to provide assembly documentation and installation schedules for opto-mechanical and electrical systems

• Guide and mentor other engineers

Required Qualifications:

• 10+ years of experience as a mechanical design engineer

• Proven history of delivering novel and innovative solutions to challenging problems

• Proficiency with 3D CAD packages; SolidWorks (preferred), CREO, Autodesk Inventor, etc.

• Thorough knowledge of drafting, tolerance analysis, and Geometric Dimensioning and Tolerancing (GD&T)

• Demonstrated experience with FEA - Structural, Modal, Random Vibration with empirical validation

• Experience with CFD analysis with empirical validation (preferred)

• Practical knowledge of manufacturing processes (machining, sheet metal, welding) and design for manufacturability (DFM)

• Experience specifying components for precision design: linear stages, rotary motors, encoders, optical sensors, pneumatic components, vacuum components, etc.

• Full design lifecycle experience including design, procurement, assembly, and test of mechanical systems

• Experience with cleanroom procedures, high-voltage, and high-vacuum environments

• Experience designing laser systems or optical instruments

• Experience with Product Data Management Systems; SolidWorks PDM (preferred)

• Applicants should be able to work both autonomously as well as collaboratively to execute tasks in support of various teams within the company

• Due to the nature of this position, applicants must be U.S. citizens or permanent residents.

Salary & Benefits:

• The base salary range for this role is $150,000 - $180,000 per year; The pay range provided is an estimated base range for this role. Exact compensation may vary based on skills, experience, and education.

• We offer market-competitive compensation and an excellent benefits program, including Medical, Dental, and Vision plans, company-paid holidays, matching 401k, and more!

About Inertia:

Inertia is taking the most direct, scientifically-proven path to commercializing fusion, leveraging the only successful achievement of fusion ignition, using a process that was pioneered at the U.S. Department of Energy’s (DOE) Lawrence Livermore National Laboratory (LLNL). With groundbreaking innovation, transformative technology, and multi-year investment, Inertia is committed to commercializing fusion energy in the next decade.

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