# Senior R&D Test Engineer - Fluid Systems 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: Devens, MA
- Work setup: On-site
- Pay: $90K to $145K base salary per year (USD)
- Posted: 2026-09-08
- Apply by: 2026-10-23
- Apply: https://jobs.lever.co/cfsenergy/e26f0fdf-79ec-4cbe-bc3e-38aefc2a1da8
- Page: https://www.1752.vc/careers/jobs/commonwealth-fusion-systems-cfs-senior-r-and-d-test-engineer-fluid-systems/

## About the role

The role of an Senior R&D Test Engineer is to develop novel fluid systems for R&D test stands, with a major focus on supporting magnet testing. The range of process fluids is broad (liquid, gaseous, cryogenic, supercritical, molten salt, etc.), requiring strong mechanical and chemical engineering fundamentals. The ideal candidate will be resourceful—combining industry best practices, off-the-shelf and customized hardware, and creativity to deliver these fluid systems on tight timelines.

## What they're looking for

- Bachelor’s degree in mechanical, chemical, process engineering, or a closely related field
- 7+ years of experience in the engineering of integrated fluid/mechanical systems (experience with both small-scale rapid R&D and large-scale systems is highly desired)
- Full-lifecycle fluid systems:
- Component expertise:
- Design documentation:
- Instrumentation:

Tags: R&D Test