Senior Mechanical Engineer, Plastics Design
Form Energy
Berkeley, CA · $129k–$193k a year · Posted February 10, 2026
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Where Berkeley, CA ranks
Where Berkeley, CA placed in our monthly rankings, month by month. Each month stays online at its own address.
November 2026
- #6Best cities for mid-career professionals in the West Coast62% · of 71
- #9Best cities for energy and utilities jobs91 openings · of 27
- #9Cities with the most jobs that need no experience in the West Coast1.3% · of 66
- #10Best cities for energy and utilities pay after cost of living$144k · of 18
- #11Cities that post pay most often43% · of 100
- #13Best cities for mid-career professionals62% · of 100
Rankings about engineering jobs
- Best cities for software and engineering jobs #1 San Francisco (3,412 openings)
- Best cities for engineering pay after cost of living #1 San Mateo ($216k)
- Most requested AI skills in engineering jobs #1 AI tools in daily work (6.1%)
- AI tools named most often in engineering jobs #1 Claude (1.7%)
- Employers with the most engineering jobs #1 Amazon (2,992 roles)
Pay compared with the market
This listing pays about $160,808 a year. Across 106 open senior mechanical engineer listings that state pay, the middle half runs $154,500 to $174,500 and the median is $170,000. That is inside the middle half of those listings, 5% below the median.
Listed pay is what employers advertise, not what people are paid.
Senior Mechanical Engineer salaries by state · Check your own pay
How AI is used in this kind of work
AI use among mechanical engineers is little observed so far. Measured exposure for mechanical engineers: 8% (little observed).
Share of this job’s tasks that AI is already used for at work, from real usage. It is not a forecast of job loss, and a low number means no use seen yet. Source: Anthropic Economic Index.
About the job
Are you ready to build America’s energy future? Form Energy is an American manufacturing and energy technology company. We’re revolutionizing energy storage with cost-effective, multi-day technology designed to keep the electric grid secure and reliable, even during extended periods of stress. By strengthening the electric system and reimagining what’s possible, we’re giving clean energy a whole new form!
In recent years, Form Energy has earned a number of accolades, including being named by TIME as a “Best Invention”, MIT Technology Review as a “Top Climate Tech Company To Watch”, and Fast Company as “One of the Next Big Things In Tech”. We are making rapid progress on our mission of delivering energy storage for a better world, and our team is growing just as rapidly to meet demand. We have signed contracts with leading electric utilities across the United States and production of our iron-air batteries is underway at our first high-volume manufacturing facility in West Virginia.
Working for Form Energy is more than just a job, it’s a chance to be part of something extraordinary. And now - right as we significantly scale up battery manufacturing - might be the most exciting moment in the company’s history to join. We are assembling a team of highly talented and driven individuals across the country. Driven by our core values of humanity, excellence, and creativity, our team is determined to deliver on our mission and transform the energy landscape for the better.
Feeling energized to make a meaningful impact on the world? Then keep reading - you’ve come to the right place.
ROLE DESCRIPTION
The Cell Engineering team within the Technology group at Form is multidisciplinary and focused on delivering qualified battery cell designs that meet operational performance targets, at cost and with high reliability, from controlled processes on high-volume manufacturing lines for Form Energy's utility-scale multi-day energy storage system.
We're hiring a Senior Mechanical Engineer to join our Cell Engineering Design team in Berkeley, CA. In this role, you will design plastic components for our iron-air battery cells. There will be a particular focus on injection molded plastics, and you will take the lead on design, test plan development, and validation testing of your components. This role will work closely with our manufacturing engineering team to define and support battery cell assembly process and equipment design. You will bring a willingness to become an expert in designing plastic components for manufacturing with injection molding, blow molding, thermoforming, or similar processes. You will also get hands-on experience with plastic joining methods, such as laser or hot-plate welding. This is an exciting opportunity to be part of scaling our multi-day energy storage system at Form and contributing to a sustainable future!
WHAT YOU'LL DO:
- Design molded plastic components for implementation in Form Energy’s iron-air battery cells
- Apply first-principles engineering to design high-performance structural plastic and sheet metal components capable of withstanding static and dynamic mechanical loads
- Own analysis, prototyping, and failure analysis efforts for plastic components
- Fabricate first-of-a-kind plastic prototypes for mechanical fit checks and verification testing
- Conduct validation testing to prove that designs meet critical requirements
- Negotiate interface requirements with Battery Module and Electrode teams
- Produce and release detailed 2D part and assembly drawings; define technical specifications (dimensional, functional, performance, manufacturing)
WHAT YOU'LL BRING:
- Degree in Mechanical Engineering, or related field; Bachelor's with 4+ years of industry experience
- Experience with end to end product development, from concept to launch
- Proficient in CAD and engineering analysis to drive design decisions
- Strong data analysis skills, especially with respect to mechanical test results
- Ability to thrive in a fast-paced startup environment
#LI-Onsite
#LI-TR1
Humanity is a cornerstone of Form Energy’s culture, and we make sure our compensation and benefits reflect that. Form Energy offers competitive salaries, stock options, and a holistic benefits package to ensure all employees have what they need to thrive while working here.
When it comes to you and your family’s health, we cover 100% of medical, dental, and vision premiums for full-time employees - and 80% of healthcare premiums for dependents. This starts from day one. We also offer at least 12 weeks of paid leave for new parents (up to 20 weeks for birthing parents), and generous vacation policies to give employees time to recharge when needed.
To build America’s energy future, we need everyone at the table. We are proud to be an equal opportunity employer, and encourage candidates from all backgrounds to apply to our open jobs.
If you may require reasonable accommodations to participate in our interview process, please contact accommodations@formenergy.com. Requests for accommodations will be treated with discretion.
Form Energy is committed to maintaining the privacy of our applicants. Please be aware that we will never solicit sensitive personal information such as Social Security numbers or bank account details during the recruiting or hiring process.