Principal Mechanical Engineer - Vacuum

Commonwealth Fusion Systems

$150K — $225K *
Manufacturing & Automotive
11 - 15 years of experience
Job Overview by Ladders

Qualifications

  • Master's degree in Mechanical Engineering or related field (or equivalent experience)
  • 15+ years in design and implementation of R&D systems or semiconductor manufacturing equipment
  • Expertise in high-temperature structural design and complex thermal management in vacuum environments
  • Deep knowledge of vacuum architecture, including material outgassing and pump-down optimization
  • Proficiency in 3D modeling (SolidWorks and/or NX) and FEA/Thermal simulation tools (COMSOL, ANSYS)
  • Hands-on experience with manual/CNC machining and hardware troubleshooting
  • Experience in selecting and qualifying vendors for specialized components or custom sub-systems

Responsibilities

  • Drive design, integration, and validation of advanced R&D processing equipment
  • Establish system-level requirements and innovative design concepts
  • Implement and maintain engineering workflows using semiconductor standards
  • Conduct design reviews emphasizing manufacturability and best practices
  • Generate and maintain interfaces with cross-functional teams
  • Report on project milestones to stakeholders, ensuring timely outcomes
  • Coach engineering staff on technical delivery and professional development
  • Act quickly to push projects from concept through assembly and testing

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
Full Job Description
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


$150,000 - $225,000 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:

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

#LI-Onsite

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