Staff Mechanical Engineer - Vacuum

Future Ventures

Milpitas (CA)

On-site

USD 150,000 - 225,000

Full time

14 days+

Application generator

Get a reply from this employer — a resume and cover letter tailored to exactly what they’re hiring for.

Get past ATS filters

Benefits offered by this job

Equity

13 Company-wide Holidays

Flexible vacation days

10 sick days

Parental leave policy

Health, dental, and vision insurance

401(k) with employer matching

Professional growth opportunities

Team-building activities

Job summary

Commonwealth Fusion Systems is seeking a Principal Mechanical Engineer to join our R&D and equipment design team to drive end-to-end design, integration, and implementation of advanced thermal vacuum equipment and R&D machinery.

This role demands technical leadership, innovative architectures, and mentoring others in a fast-paced setting, solving complex vacuum-based thermal-mechanical problems with impact across projects.

Qualifications

Master’s degree in Mechanical Engineering or related field.
15+ years in design and implementation of complex R&D systems or semiconductor equipment.
Thermal and structural design experience in vacuum environments.
Deep understanding of vacuum architecture, outgassing, seals and pump-down.
Proficiency in 3D CAD and FEA/thermal simulation tools.
Hands-on experience bridging design and shop floor activities.
Vendor management with global suppliers.
Strong leadership in direct and matrixed teams.

Responsibilities

Lead system design of advanced R&D processing equipment.
Define system-level requirements linked to mechanical precision.
Standardize engineering workflows using semiconductor standards.
Lead design reviews focusing on manufacturability (DFx).
Collaborate with scientists, vacuum specialists and electrical engineers.
Report milestones to stakeholders ensuring on-time, in-spec delivery.
Mentor engineers on technical delivery and safety.
Drive projects from concept through assembly and testing.

Skills

Thermal design

Vacuum systems

3D CAD (SolidWorks/NX)

FEA/thermal simulations

Machining & prototyping

Vendor management

Leadership

DFx

Motion control

Education

Master's degree in Mechanical Engineering

Tools

SolidWorks

COMSOL

ANSYS

Job description

About Commonwealth Fusion Systems

Commonwealth Fusion Systems is on a mission to deliver the urgent transition to fusion energy.

Combining decades of research, top talent, and new technologies, we’re designing and building commercially viable fusion power plants. And we're working with policymakers, suppliers, and many others to build the energy industry of the future.

We’re in the best position to make it happen. Since 2018, we’ve raised $4 billion of capital, making us the largest and leading fusion company in the world.

Now we’re looking for more thinkers, doers, builders, and makers to join us. People who’ll bring new perspectives, solve tough problems, and thrive as part of a team.

If that’s you and this role fits, we want to hear from you.

Join the power movement as a Principal Mechanical Engineer

We’re looking for a Principal Mechanical Engineer to join our R&D and equipment design team to help build the next generation equipment. You will be responsible for the end-to-end design, integration, and implementation of advanced thermal vacuum equipment and R&D machinery.

This role requires you to be a technical expert who can drive innovative architecture while maintaining the procedural discipline necessary for high-performance hardware. If you enjoy solving complex thermal-mechanical problems in vacuum environments and mentoring others in a collaborative, fast-paced setting, this is your opportunity to make an impact.

What you'll do:

Lead System Design: Drive the design, integration, and validation of advanced R&D processing equipment
Define Requirements: Establish system-level requirements and innovative design concepts that directly correlate mechanical precision to product quality
Standardize Best Practices: Implement and maintain engineering workflows, and best practices using semiconductor standards as your guide
Lead Design Reviews: Conduct rigorous reviews for overall mechanical systems and sub-systems, emphasizing manufacturability (DFx) and best practices for mechanical design
Collaborate & Interface: Generate and maintain critical interfaces with cross-functional teams, including scientists, vacuum specialists, and electrical engineers
Project Accountability: Report on project milestones to stakeholders, ensuring delivery of on-time and in-spec outcomes
Mentor Talent: Coach engineering staff on technical delivery, procedural discipline, and professional development
Get Things Done: Act with speed to drive projects from concept through assembly, testing, and implementation

What we’re looking for:

Education: Master’s degree in Mechanical Engineering or a related field (or equivalent industrial experience)
Experience: 15+ years of experience in the design and implementation of complex R&D systems or semiconductor manufacturing equipment
Thermal & Structural Expertise: Proven capability in high-temperature structural design and complex thermal management within vacuum environments
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
Vendor Management: Experience selecting and qualifying global vendors for specialized components or custom sub-systems
Leadership: Demonstrated ability to lead effectively in both direct and matrixed organizational structures

Bonus points for:

R2R Expertise: Experience designing or integrating roll-to-roll (R2R) systems for material processing
Semiconductor Background: Prior success building first-of-kind or experimental tools for semiconductor R&D or thin-film deposition
Standards Knowledge: Familiarity with SEMI, ASME, ASTM, and other industry-standard mechanical codes
Motion Control: Experience designing precision motion and motor-controlled systems within challenging environments

Must-have requirements:

Ability to lift up to 25 lbs occasionally
Perform activities such as stooping, climbing, standing, sitting for extended periods of time
Willingness to travel or work required nights/weekends/on-call occasionally
Dedication to safety to mitigate industrial hazards that may include heat, cold, noise, fumes, strong magnets, lead (Pb), high voltage, high current, pressure systems, and cryogenics

#LI-Onsite

At CFS, we excel in fast-paced environments, driven by our values of integrity, execution, impact, and self-critique. As we grow, we’re eager to bring on mission-driven folks who offer diverse perspectives and fresh ways to tackle challenges.

We value diversity deeply and are proud to be an equal opportunity employer by choice. We consider all qualified applicants equally, regardless of race, color, national origin, ancestry, citizenship status, protected veteran status, religion, physical or mental disability, marital status, sex, sexual orientation, gender identity or expression, age, or any other basis protected by law.

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.

150000 - 225000 USD a year

Salary range for this full-time position + equity + benefits

The actual salary will depend on level, location, qualifications, and experience. The range displayed on each job posting reflects new hire salaries for the position across all US locations.

Benefits include: