Senior Principal Mechanical Engineer

Diamond Foundry

Bay Area, California on site Until 9/16/2026 15+ years exp H-1B sponsor history First posted July 18, 2026 Last posted July 18, 2026

Job description

Diamond Foundry Inc. is solving the thermal limitation at the foundation of today's most exciting tech industries -- AI & cloud compute, electric-car power electronics, and 5G/6G wireless. We have managed to produce the world's first single-crystal diamond wafers and are now on a mission to put a diamond behind every chip. We are the rare unicorn that has grown fast and profitably. We received $515m in funding and are executing a multi-$B expansion plan for one of the greenest forms of tech manufacturing: converting greenhouse gas into diamond wafers using zero-emission energy.

We’re looking for an ambitious Mechanical Engineer to take responsibility for designing capital equipment and facilities systems, working across multiple engineering disciplines. You'll be working with an experienced team of mechanical and electrical engineers to take a pragmatic approach to equipment and facility design. You’ll be responsible for whole projects, pulling in the talents of others when needed.

This position will work out of our South San Francisco location.

Responsibilities

Designing, building, testing, and optimizing systems for high-volume capital equipment and high vacuum manufacturing equipment.

Prototyping and integration of new system functions to enhance existing equipment

Managing multiple domestic and international suppliers to construct parts and assemblies on time and within budget

Effective communication skills and ability to convey complex technical concepts to diverse stakeholders

Requirements

Bachelor's or Master's degree in Mechanical Engineering or a related field with 15+ years of applicable engineering design experience for high-volume, low-cost manufacturing tools.

Experience in 2D and 3D CAD (specifically AutoCAD and SolidWorks), proficiency in PDM and/or PLM software and systems, experience with welded steel frames, sheet metal, machined parts, process piping design and related connections, and documentation for high-volume builds.

Experience with electrical and pipe routing design such as high purity gases, caustic and explosive gases, manual and automatic valves, and experience with their appropriate use. Experience with commercially available piping connection systems for high pressure and high vacuum, welding methods, and applicable safety considerations for these systems. Experience with mechanical automation, repetitive moving systems, material flow, robotics, precision alignment of large tools, and facilities design.

Strong analytical skills to investigate and provide solutions for problems across multiple systems within a facility

Excellent problem-solving skills and ability to work in a fast-paced, collaborative environment

Diamond Foundry believes in supporting our employees from the workplace to their personal and home life. We provide eligible employees with an opportunity to enroll in a variety of benefit programs, generally including health insurance, flexible spending accounts, retirement savings plans, life and disability insurance programs, and a number of programs that provide for both paid and unpaid time away from work. Perks include employee discounts to VRAI. Our benefits begin as early as your first day of employment. Medical and vision coverage are retroactive to your start date, while dental and voluntary benefits take effect once you’ve completed your enrollment.

Diamond Foundry is an Equal Opportunity Employer and considers qualified applicants for employment without regard to race, color, creed, religion, national origin, sex, sexual orientation, gender identity and expression, age, disability, veteran status, or any other protected factor under federal, state or local law.

Diamond Foundry Inc. is committed to operating in full compliance with all applicable state and federal laws. Our commitment extends to ensuring that our manufacturing and engineering departments adhere to the highest standards of legal and regulatory compliance. Additionally, these departments may have specific physical requirements to ensure the safety and efficiency of our operations. We prioritize the well-being of our employees and strive to create a work environment that promotes both legal compliance and the optimal functioning of our manufacturing and engineering processes.

Manufacturing and Engineering Departments Physical Requirements:

-Use appropriate PPE and follow all safety policies, practices, and procedures.

-This position will often: Sit, stand for long periods, walk, grasp, reach with hands and arms, lift below and above shoulders, bend, twist at the waist, climb, balance, stoop, squat, kneel, crawl, talk, hear, see, use fine finger manipulation, and complete repetitive motions.

-Some tasks may require the use of ladders or stairs

-Some tasks may require driving or the use of foot controls

-Lift/carry and push/pull up to 50 pound

This employer participates in E-Verify and will provide the federal government with your Form I-9 information to confirm that you are authorized to work in the U.S.

If E-Verify cannot confirm that you are authorized to work, this employer is required to give you written instructions and an opportunity to contact Department of Homeland Security (DHS) or Social Security Administration (SSA) so you can begin to resolve the issue before the employer can take any action against you, including terminating your employment.

Employers can only use E-Verify once you have accepted a job offer and completed the Form I-9.

Compensation (from employer):
185000–200000 USD per year

About this role

Summary

Design and oversee high-volume manufacturing systems, manage suppliers, and improve equipment performance.

Job title

Senior Principal Mechanical Engineer

Experience level

15+ years

Minimum experience

15+ years exp

Industry

manufacturing

Location requirements

On-site in South San Francisco, no remote work allowed.

Salary

$185k–$200k

Visa sponsorship

H-1B sponsor history

Management role

Skills & keywords

Required skills

Mechanical engineeringAutoCADSolidWorksPDMPLMweldingpipe routingautomationproblem-solving

Preferred skills

None specified

Specializations

mechanical designhigh vacuum systemsCADprocurementautomation

Locations

Structured locations inferred from the posting.

Unknown location

On-site

South San Francisco, CA, USA

On-site City