Cell Product Development Engineer
Factorial Energy
Company Overview
Factorial Energy
Woburn, Massachusetts, United States
2013
Approximately 150 employees (source: linkedin.com). Factorial has raised over $65 million and achieved a $1 billion valuation (source: batteryburnbook.com).
What They Do
Factorial Energy specializes in the development of solid-state batteries, which are pivotal for various applications including electric mobility, defense, AI/robotics, aviation, power tools, marine vehicles, consumer electronics, and energy storage systems. Their technology emphasizes high energy density, achieving 350-450 Wh/kg compared to the 200-300 Wh/kg typical of current electric vehicle (EV) cells. Additionally, Factorial's batteries are designed for enhanced safety, fast charging capabilities, and a wide operational temperature range from -30°C to 45°C (source: factorialenergy.com).
The core of their innovation lies in the Factorial Electrolyte System Technology (FEST®), which utilizes a quasi-solid polymer electrolyte combined with an ultrathin lithium-metal anode and a high-capacity cathode. This technology allows for approximately 80% compatibility with existing lithium-ion production lines, facilitating scalability and integration into current manufacturing processes (source: factorialenergy.com).
Complementary technologies such as Solstice™, a sulfide-based all-solid-state electrolyte, and Gammatron™, an AI-driven battery digital twin software, further enhance their offerings. Solstice™ boasts high thermal stability and zero liquid content, while Gammatron™ accelerates R&D in electrolyte development and battery management systems (source: enertherm-engineering.com).
Projects & Track Record
Factorial Energy has achieved significant milestones in battery development, including a series of prototypes that have progressively increased in capacity and complexity. Notable achievements include the validation of 0.6 Ah Li-metal chemistry in 2017, the introduction of a 40 Ah 30-layer graphite anode prototype in 2021, and the unveiling of a 106 Ah automotive B-sample cell at CES 2023. These advancements demonstrate Factorial's commitment to pushing the boundaries of solid-state battery technology (source: factorialenergy.com).
Recent Developments
In October 2023, Factorial Energy inaugurated its $50 million manufacturing facility in Methuen, Massachusetts, which is set to be the largest solid-state battery production line in the U.S. with a capacity of 200 MWh. This facility is expected to significantly enhance their production capabilities and support the scaling of automotive applications (source: waveep.com).
In 2024, the company shipped 106 Ah B-samples to various OEMs and unveiled their Solstice™ technology after a period of stealth development. Additionally, they have been recognized as a leading player in the deep tech sector, ranking #25 among the Top 100 Private Deep Tech Companies (source: factorialenergy.com).
Working There
Factorial Energy is actively hiring across various departments including R&D, manufacturing, sales, and engineering, particularly in response to their recent expansion efforts. The Methuen facility is expected to create over 150 jobs, contributing to the local economy while supporting the company's growth in solid-state battery production. The company culture emphasizes speed and innovation, with a focus on ethical governance and sustainability goals, including a commitment to carbon-neutral production by mid-2030 (source: factorialenergy.com).
Last updated on Feb 23, 2026 | Report an issue
Factorial Energy is a pioneering U.S.-based solid-state battery company driving the future of energy storage and electrification. Partnered with global leaders including Mercedes-Benz, Stellantis, Hyundai, and Kia, Factorial is at the forefront of developing next-generation e-mobility platforms for commercial, defense, and consumer applications-spanning electric vehicles (EVs), drones, eVTOL aircraft, power tools, marine systems, robotics, and more. The company has achieved multiple industry firsts, including being the first to power a demonstration vehicle with a global OEM (Mercedes- Benz) which achieved over 1,200 km (749 mi) of range, and the first to earn UN 38.3 certification for automotive-sized lithium-metal solid-state cells, the first to deliver B-samples of automotive-sized solid-state batteries to major OEMs.
The Opportunity
Factorial Energy is seeking a Cell Product Development Engineer to join our team in our Cheonan, South Korea, location. This person will be responsible for EV pouch and prismatic cell design and development. The ideal candidate will have experience in cell product development and be able to interpret test plans and collaborate with the development team to complete cell qualifications.
In this role, you will
- Develop and optimize cell design, including production, validation, certification, use cases, DVP, and report templates
- Coordinate with customers regarding testing standards, plans, and schedules
- Lead mass production readiness assessments and execute DV (Design Verification) evaluations in accordance with product development milestones
- Follow up on cell testing, including conducting tests, analyzing results, resolving testing issues, and supporting the cell development team in failure analysis
- Track and interpret international standards and regulations, and benchmark against industry-leading testing standards
We are looking for people who
- Have a Master's degree
- Have at least 3 years of relevant experience in cell development, are familiar with cell design and production, and understand testing standards and safety regulations
- Are able to quickly understand various customer requirements and possess the ability to convert requirements and write test plans
- Have strong FA, problem-solving, and data analysis capabilities
- Have strong teamwork and cross-departmental communication skills, and are able to effectively collaborate with personnel from different departments to advance testing progress
- Have an understanding of lithium battery working principles, degradation mechanisms, and influencing factors, with strong data analysis capabilities, safety awareness, and meticulous attention to data
- Are fluent in English (written and spoken)
- Have a strong sense of responsibility and dedication
Work Location
Cheonan, South Korea
Factorial Energy is an equal opportunity employer that values diversity at all levels. All qualified applicants, regardless of personal characteristics, are encouraged to apply.
To request a reasonable accommodation to complete an application, job interview, and/or to otherwise participate in the hiring process, please contact ([email protected])
Apply now
Job expired?Please let Factorial Energy know you found this job on Rejobs. This will help us grow and get more people to work on renewable energy!
Apply now
Job expired?Please let Factorial Energy know you found this job on Rejobs. This will help us grow and get more people to work on renewable energy!
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About the role
May 26, 2026
Full time
Company
- Cheonan, South Korea
3 years of relevant experience
UTC+09:00
