Internship Solid State Battery Jobs (NOW HIRING)

Who We Are

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 Manager/Senior Manager, Solid-State Battery Product Development to join our team in our Billerica, MA location. This person will be responsible for leading lithium-ion cell new product development. The ideal candidate will own the full design-to-manufacturing lifecycle — from prototype design and validation through pilot-line scale-up and production ramp — and partner with R&D, process, manufacturing, and quality teams to translate technical breakthroughs into scalable, reliable products.

In this role, you will:

• Lead lithium-ion cell design, validation, and transfer from prototype to mass production
• Define specifications, performance targets, and acceptance criteria
• Drive root-cause investigations, develop new characterization methods, and continuously improve cycle life, safety, and yield
• Collaborate with process engineers, suppliers, and external vendors to source, qualify, and scale high-quality materials, components, and tooling
• Support customer projects with technical reports, datasheets, and on-time delivery of milestones
• Participate in DFMEA/PFMEA reviews
• Partner across R&D, manufacturing, and quality to ensure smooth handoffs, alignment on KPIs, and on-time program delivery in a fast-paced team environment
• Stay current with industry advances in LIB and solid-state technology, evaluate new materials and processes, and bring forward improvements that strengthen product reliability and cost

We are looking for people who:

• has 5–10 years of hands-on experience in lithium-ion battery (LIB) product development, and has led or substantially contributed to lithium-ion cell design, validation, and transfer from prototype to mass production
• holds a Bachelor's degree or higher in Materials Science, Chemical Engineering, Chemistry, or a related field, with an advanced degree (M.S. or Ph.D.) preferred
• brings a strong background in cell design, electrochemistry testing, materials characterisation, and failure analysis, ideally with pilot-line scale-up and DFMEA/PFMEA experience
• has solid-state battery experience (preferred but not required)
• is willing and able to thrive in a fast-paced, high-pressure environment with tight deadlines and shifting priorities
• is a strong team player — collaborative, communicative, and dependable
• can work fully on-site in Billerica, MA, with occasional cross-site collaboration with global teams
• is familiar with automotive quality frameworks (IATF 16949, APQP, PPAP)

Some of our competitive benefits include:

• Medical, dental, and vision insurance
• Generous paid time off
• 401(k) plan that includes employer matching funds
• Education assistance plan
• Life insurance and disability coverage

Salary Range : $135K-$175K Annual base+ Equity Incentives

Work Location:

805 Middlesex Turnpike, Billerica, MA 01821

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 (recruitment@factorialenergy.com)