Senior Mechanical Engineer, Vacuum & Thermal Systems

Commonwealth Fusion Systems LLC; Milpitas (CA); On-site; USD 146,000 - 210,000; Full time

Benefits offered by this job

Health, dental, and vision insurance

Equity and competitive compensation

Generous holidays and time off

Professional growth opportunities

Job summary

Commonwealth Fusion Systems LLC is seeking a Senior Mechanical Engineer to lead end-to-end design, integration and validation of advanced R&D equipment. You will drive system architecture, define requirements, and implement best practices to ensure high-performance hardware in vacuum environments.

The role emphasizes mentoring, cross-functional collaboration with scientists and engineers, and rapid execution from concept through assembly, testing, and deployment.

Qualifications

• Master’s degree in Mechanical Engineering or related field.
• 7+ years designing and implementing complex R&D systems or semiconductor equipment.

Responsibilities

• Own the design, integration, and validation of R&D equipment.
• Establish system-level requirements and innovative design concepts.
• Implement engineering workflows and best practices using semiconductor standards.
• Lead design reviews focusing on manufacturability and best practices.

Skills

System design

Requirements definition

DFx design

Design reviews

Cross-functional teamwork

3D modeling

FEA / thermal analysis

Mentoring

Project leadership

Education

Master’s degree in Mechanical Engineering

Tools

SolidWorks

NX

COMSOL

ANSYS

Job description

Commonwealth Fusion Systems LLC is seeking a Senior Mechanical Engineer to lead end-to-end design, integration and validation of advanced R&D equipment. You will drive system architecture, define requirements, and implement best practices to ensure high-performance hardware in vacuum environments.

The role emphasizes mentoring, cross-functional collaboration with scientists and engineers, and rapid execution from concept through assembly, testing, and deployment.