Commonwealth Fusion Systems · 4 hours ago
Principal Mechanical Engineer
Milpitas, CA
Full-time
Onsite
Senior Level, Lead/Staff
$150K/yr - $225K/yr
15+ years expCommonwealth Fusion Systems is on a mission to deliver the urgent transition to fusion energy, designing and building commercially viable fusion power plants. They are seeking a Principal Mechanical Engineer to lead the design and implementation of advanced R&D equipment for thin-film deposition technology, collaborating with a multi-disciplinary team to ensure high-performance outcomes.
Clean EnergyElectrical DistributionEnergyEnvironmental EngineeringRenewable Energy
Responsibilities
Lead the design and implementation of advanced R&D equipment for thin film processing, including ownership of key mechanical modules and sub-systems
Define system level requirements and drive innovative design concepts to meet these requirements
Lead design reviews for overall mechanical system and key mechanical subsystems
Generate and maintain interfaces with other engineering subsystems
Report on and be accountable for project progress to stakeholders
Work effectively within a multi-disciplinary team of top scientists and engineers
Mentor engineering staff for effectiveness and delivery of on-time & in-spec outcomes
Get things done: drive projects, consistently deliver, act with speed
Qualification
Required
Master's degree in Mechanical Engineering or related field (or equivalent industrial experience)
15+ years of experience with at least 7 years of experience working as a principal mechanical design engineer or engineering team lead in a relevant context: design and implementation of R&D systems and manufacturing equipment
Ability to conceive of novel solutions for complex engineering systems in challenging environments
Expertise with 3D modeling; preferred experience with SolidWorks and NX
Experience with COMSOL, ANSYS or other FEA tools
Ability to select and qualify vendors for components or subsystems
Demonstrated ability to lead in either direct or matrix structures
Strong verbal and written communication skills and a dedication to high-quality documentation
Ability to occasionally lift up to 50 lbs
Perform activities such as stooping, climbing, standing, or sitting for extended periods of time
Dedication to safety to mitigate industrial hazards that may include heat, cold, noise, fumes, strong magnets, lead (Pb), high voltage, and cryogenics
Willingness to travel or work required nights/weekends/on-call occasionally
Preferred
Ph.D. in Mechanical Engineering or related field (or equivalent industrial experience)
Prior success building first-of-kind or experimental tools for material science or semiconductor R&D
Familiarity in applying Semi-S8, ASME, ACI, ASTM, and other mechanical standards to design solutions
Experience with the operation of equipment in a manufacturing environment
Benefits
Competitive compensation with equity
13 Company-wide Holidays
Flexible vacation days
10 sick days
Generous parental leave policy
Health, dental, and vision insurance
401(k) with employer matching
Professional growth opportunities
Team-building activities
Company
Commonwealth Fusion Systems
Commonwealth Fusion Systems designs and develops commercial fusion energy systems to produce clean energy.
501-1000 employees
Funding
Current Stage
Late StageTotal Funding
$2.88BKey Investors
GoogleUS Department of EnergyTiger Global Management
2025-08-27Series B· $863M
2025-06-30Corporate Round
2024-06-06Grant· $15M
Leadership Team
Robert Mumgaard
Chief Executive Officer and Co-Founder
Martin Greenwald
Cofounder
Recent News
Crowdfund Insider
2026-01-22
2026-01-13
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