Staff Mechanical Engineer

Commonwealth Fusion Systems

$130K — $200K *
Manufacturing & Automotive
8 - 10 years of experience
Job Overview by Ladders

Qualifications

  • Master's degree in Mechanical Engineering or related field (or equivalent industrial experience)
  • 10+ years in design and implementation of complex R&D systems or semiconductor manufacturing equipment
  • Expert-level mastery of mechanical engineering functions with focus on thin-film processing hardware or vacuum systems
  • Proven ability to operate autonomously with sound judgment in complex projects
  • Expertise in high-temperature structural design and thermal management in vacuum environments
  • Deep understanding of vacuum architecture, material outgassing, and optimization techniques
  • Experience in 3D modeling (SolidWorks/NX) and FEA/Thermal simulation tools (COMSOL, ANSYS)

Responsibilities

  • Drive design, integration, and validation of advanced R&D equipment for thin-film processing
  • Provide technical leadership on complex cross-functional projects and serve as a discipline-specific advisor
  • Address ambiguous technical challenges proactively and generate novel solutions
  • Generate detailed work plans and milestones for hardware developments
  • Drive continuous process improvement and development of department policies using semiconductor standards
  • Independently manage project risks and develop robust mitigation solutions
  • Build relationships across departments and communicate complex concepts effectively

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 Staff Mechanical Engineer

We're looking for a Staff Mechanical Engineer to join our R&D and equipment design team to help build the next generation of thin-film deposition technology. Serving as the "Second Chair" within our engineering group, you will be a high-impact technical leader who leads by example, solving highly complex, semi-ambiguous problems that influence the success of multiple teams.

You will be responsible for the end-to-end design, integration, and implementation of advanced thermal vacuum deposition systems and complex R&D machinery. Operating with near-complete independence, you will manage long-term assignments with loosely-defined outcomes, balancing expert-level technical execution with the operational discipline required to ship high-performance hardware.

What you'll do:

  • Own System Execution:
    • Drive the design, integration, and validation of advanced R&D equipment for thin-film processing, taking independent ownership of long-term projects and major mechanical sub-systems
  • Act as technical Lead & Responsible Engineer (RE):
    • Provide technical leadership on complex, cross-functional projects, leading small project groups and serving as a discipline-specific advisor
  • Solve Highly Complex Problems:
    • Address ambiguous technical challenges impacting multiple groups, proactively removing project barriers and generating novel solutions
  • Plan & Organize Milestones:
    • Generate detailed work plans and milestones for complex and semi-ambiguous hardware developments
  • Standardize Best Practices & Policies:
    • Drive continuous process improvement, tool development, and department policies using semiconductor standards as your guide
  • Manage Project Risk:
    • Independently manage medium risks, identify larger system risks, and drive the development of robust mitigation solutions
  • Collaborate & Influence:
    • Build strong relationships across departments, effectively communicating highly complex concepts to diverse audiences and resolving cross-functional conflicts to achieve alignment
  • Mentor Talent:
    • Actively mentor junior colleagues, taking direct ownership of their technical growth and skill development
  • Deliver with Speed:
    • Translate system-level requirements into innovative concepts, driving projects efficiently from initial design 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:
    • 10+ years of experience in the design and implementation of complex R&D systems or semiconductor manufacturing equipment
  • Domain Expertise:
    • Expert-level mastery of core mechanical engineering functions with a deep technical focus on thin-film processing hardware or vacuum systems
  • Autonomy & Judgment:
    • Proven ability to operate independently with near-complete autonomy, making sound judgment calls that impact the overall success of major project components
  • 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 familiarity with leveraging FEA/Thermal simulation tools (COMSOL, ANSYS) to make data-driven decisions
  • 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


Bonus points for:

  • Semiconductor Background:
    • Prior success building first-of-kind or experimental tools for semiconducto
  • Standards Knowledge:
    • Familiarity with applying SEMI, ASME, ASTM, and other industry-standard mechanical codes to hardware designs
  • Motion Control:
    • Experience designing precision motion and motor-controlled systems within challenging environments


Must-have Requirements:

  • Ability to occasionally lift up to 50 lbs
  • Perform activities such as stooping, climbing, standing, or sitting for extended periods of time
  • Dedication to safety to mitigate industrial hazards that may include heat, cold, noise, fumes, strong magnets, lead (Pb), high voltage, and cryogenics
  • Willingness to travel or work required nights/weekends/on-call occasionally


$130,000 - $200,000 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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