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HomeCompaniesCfsenergyPrincipal Mechanical Engineer

Principal Mechanical Engineer

Cfsenergy · Milpitas, CA · On Site · Active · $150,000–$225,000 / year · Lever

Job facts

FieldValue
CompanyCfsenergy
TitlePrincipal Mechanical Engineer
Normalized title-
Department / teamSuperconductor / Tool Development
LocationMilpitas, CA, United States
Work modelOn Site
Employment typeFull Time
Salary$150,000–$225,000 / year
Statusactive
ATS providerLever
Posted / first seen2026-04-15 / 2026-05-29
Changed / last seen2026-05-29 / 2026-06-18

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PageWhat it containsOpen
Company jobsActive postings from Cfsenergy.Open
Company breakdownsRole, location, ATS, and work model facets for this company.Open
ATS provider jobsActive postings observed through Lever.Open
Provider filtered searchThe same provider as a filtered job collection.Open
City jobsActive postings in Milpitas.Open
Department jobsActive postings in Superconductor.Open
Work model jobsActive On Site postings.Open
Lifecycle eventsOpen, update, close, and reopen events for this posting.Open
Original postingCanonical source or apply URL captured from the ATS.Open

Linked records

CompanyCfsenergy
Sourcebd1d77fb-1ebc-4a7f-932c-220948eab723
ATS providerLever

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 and suppliers to build the energy industry of the future. We’re in the best position to make it happen. Since 2018, we’ve raised nearly $3 billion in capital, making us the largest and leading private 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 of thin-film deposition technology. You will be responsible for the end-to-end design, integration, and implementation of advanced thermal vacuum deposition systems and complex 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. #LI-Onsite #CFS-EX 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. What you'll do: Lead System Design: Drive the design, integration, and validation of advanced R&D equipment for thin-film processing Define Requirements: Establish system-level requirements and innovative design concepts that directly correlate mechanical precision to final thin-film 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 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

Full job record

Job ID40823939182a96712d1466817173f97b066ea941
Org IDe3825e08-a702-4b45-890c-2b55d565e966
Source IDbd1d77fb-1ebc-4a7f-932c-220948eab723
Board IDbd1d77fb-1ebc-4a7f-932c-220948eab723
Providerlever
Provider Job Keye2af201d-ec4b-404e-9f70-1496854d23f5
TitlePrincipal Mechanical Engineer
Normalized Title
Statusactive
Activeyes
Location TextMilpitas, CA
DepartmentSuperconductor
TeamTool Development
Employment TypeFull-time
Workplace Typeon_site
Remote Policy
CountryUnited States
RegionCA
CityMilpitas
Salary RawUSD 150000-225000 per-year-salary
Salary Min150,000
Salary Max225,000
Salary CurrencyUSD
Salary Periodyear
Source URLhttps://jobs.lever.co/cfsenergy/e2af201d-ec4b-404e-9f70-1496854d23f5
Apply URLhttps://jobs.lever.co/cfsenergy/e2af201d-ec4b-404e-9f70-1496854d23f5/apply
First Seen At2026-05-29 07:00:47Z
Last Seen At2026-06-18 07:57:33Z
Last Checked At2026-06-18 07:57:33Z
Last Changed At2026-05-29 07:00:47Z
Inactive At
Source Posted At2026-04-15 15:55:06Z
Source Updated At
Raw Payload Uris3://job-postings-prod-raw-590183727216/raw/provider=lever/board=cfsenergy/date=2026-06-18/2026-06-18T07-57-33-128Z-9ac7ac6444546e8f4c96177a015a6951503aeaf8d23a8b358c7df0efba61615d.json
Event Fields
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Parsed Structured
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Extensions
{}
Native Structured
{
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    {
      "text": "What you'll do:",
      "content": "<ul style=\"list-style-type: disc;\">\n<li style=\"text-align: left;\"><strong>Lead System Design:</strong> Drive the design, integration, and validation of advanced R&amp;D equipment for thin-film processing</li>\n\n<div style=\"text-align: left;\">&nbsp;</div>\n<ul style=\"list-style-type: disc;\">\n<li style=\"text-align: left;\"><strong>Define Requirements:</strong> Establish system-level requirements and innovative design concepts that directly correlate mechanical precision to final thin-film product quality</li>\n\n<div style=\"text-align: left;\">&nbsp;</div>\n<ul style=\"list-style-type: disc;\">\n<li style=\"text-align: left;\"><strong>Standardize Best Practices:</strong> Implement and maintain engineering workflows, and best practices using semiconductor standards as your guide</li>\n\n<div style=\"text-align: left;\">&nbsp;</div>\n<ul style=\"list-style-type: disc;\">\n<li style=\"text-align: left;\"><strong>Lead Design Reviews:</strong> Conduct rigorous reviews for overall mechanical systems and sub-systems, emphasizing manufacturability (DFx) and best practices for mechanical design</li>\n\n<div style=\"text-align: left;\">&nbsp;</div>\n<ul style=\"list-style-type: disc;\">\n<li style=\"text-align: left;\"><strong>Collaborate &amp; Interface:</strong> Generate and maintain critical interfaces with cross-functional teams, including scientists, vacuum specialists, and electrical engineers</li>\n\n<div style=\"text-align: left;\">&nbsp;</div>\n<ul style=\"list-style-type: disc;\">\n<li style=\"text-align: left;\"><strong>Project Accountability:</strong> Report on project milestones to stakeholders, ensuring delivery of on-time and in-spec outcomes</li>\n\n<div style=\"text-align: left;\">&nbsp;</div>\n<ul style=\"list-style-type: disc;\">\n<li style=\"text-align: left;\"><strong>Mentor Talent:</strong> Coach engineering staff on technical delivery, procedural discipline, and professional development</li>\n\n<div style=\"text-align: left;\">&nbsp;</div>\n<ul style=\"list-style-type: disc;\">\n<li style=\"text-align: left;\"><strong>Get Things Done:</strong> Act with speed to drive projects from concept through assembly, testing, and implementation</li>\n</ul></ul></ul></ul></ul></ul></ul></ul>"
    },
    {
      "text": "What we’re looking for:",
      "content": "\n<li><strong>Education:</strong> Master’s degree in Mechanical Engineering or a related field (or equivalent industrial experience)</li>\n\n<div>&nbsp;</div>\n\n<li><strong>Experience:</strong> 15+ years of experience in the design and implementation of complex R&amp;D systems or semiconductor manufacturing equipment</li>\n\n<div>&nbsp;</div>\n\n<li><strong>Thermal &amp; Structural Expertise:</strong> Proven capability in high-temperature structural design and complex thermal management within vacuum environments</li>\n\n<div>&nbsp;</div>\n\n<li><strong>Vacuum System Proficiency:</strong> Deep understanding of vacuum architecture, including material outgassing, seal integrity, and pump-down optimization</li>\n\n<div>&nbsp;</div>\n\n<li><strong>Software Mastery:</strong> Expertise in 3D modeling (SolidWorks and/or NX) and FEA/Thermal simulation tools (COMSOL, ANSYS)</li>\n\n<div>&nbsp;</div>\n\n<li><strong>Hands-on Capability:</strong> Ability to bridge the gap between design and the shop floor, including experience with manual/CNC machining, prototyping, and hardware troubleshooting</li>\n\n<div>&nbsp;</div>\n\n<li><strong>Vendor Management:</strong> Experience selecting and qualifying global vendors for specialized components or custom sub-systems</li>\n\n<div>&nbsp;</div>\n\n<li><strong>Leadership:</strong> Demonstrated ability to lead effectively in both direct and matrixed organizational structures.</li>\n"
    },
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      "text": "Bonus points for: ",
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    },
    {
      "text": "Must-have Requirements: ",
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    }
  ],
  "country": "US",
  "createdAt": 1776268506564,
  "updatedAt": null,
  "categories": {
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