# Senior Mechanical Engineer - Vacuum at Commonwealth Fusion Systems (CFS)

- Company: Commonwealth Fusion Systems (CFS)
- What the company does: The world's largest and leading commercial fusion energy company. Backed by Khosla.
- Company website: https://cfs.energy/
- Type: Startups
- Level: Senior
- Location: Milpitas, CA
- Work setup: On-site
- Pay: $146K to $210K base salary per year (USD)
- Posted: 2026-10-28
- Apply by: 2026-12-12
- Apply: https://jobs.lever.co/cfsenergy/a747666a-bc36-4b0c-8106-bfe8e559d582?utm_source=1752vc&utm_medium=careers
- Page: https://www.1752.vc/careers/jobs/commonwealth-fusion-systems-cfs-senior-mechanical-engineer-vacuum/

## About the role

This role requires compliance with U.S. laws concerning the export of controlled or protected technologies or information (collectively, “Export Control Laws"). Any offer of employment will be contingent on the need for compliance with such Export Control Laws. Found on 1752vc Careers, the job board for startup and VC roles.

## What they're looking for

- Education: Master’s degree in Mechanical Engineering or a related field (or equivalent industrial experience)
- Experience: 7+ years of experience in the design and implementation of complex R&D systems or semiconductor manufacturing equipment
- Thermal & Structural Expertise: Practical experience managing vacuum architecture (pumps, gauges, leak detection) and thermal management systems (chillers, heat exchangers)
- Vacuum System Proficiency: Deep understanding of vacuum architecture, including material outgassing, seal integrity, and pump-down optimization
- Software Mastery: Expertise in 3D modeling (SolidWorks and/or NX) and FEA/Thermal simulation tools (COMSOL, ANSYS)
- Hands-on Capability: Ability to bridge the gap between design and the shop floor, including experience with manual/CNC machining, prototyping, and hardware troubleshooting

Tags: Tool Development

Source: 1752vc Careers, https://www.1752.vc/careers/jobs/commonwealth-fusion-systems-cfs-senior-mechanical-engineer-vacuum/