Senior / Staff Cell Stacking Equipment Engineer

Factorial Energy is an American solid-state battery company headquartered in Billerica, Massachusetts, focused on developing high-performance energy storage solutions for electric mobility, defense, and AI-driven robotics applications. The company designs and manufactures solid-state batteries that overcome the fundamental limitations of conventional lithium-ion technology, including energy density constraints, weight penalties, and safety concerns associated with liquid electrolytes. Factorial's batteries have demonstrated real-world capability, including powering a vehicle on a drive exceeding 1,200 kilometers on a single charge using solid-state cells. Factorial's mission centers on advancing American technology leadership, economic resilience, and domestic industrialization of next-generation battery technology. The company positions its work as critical to U.S. national security, energy independence, and global competitiveness across the automotive, defense, and robotics sectors. With over 10 years of research and development and more than 150 patents and patent applications, Factorial has built a deep intellectual property portfolio and established partnerships with four top-tier automotive manufacturers, including Stellantis. What distinguishes Factorial is its capital-efficient manufacturing approach: its technology is approximately 80 percent drop-in compatible with existing lithium-ion production infrastructure, significantly reducing the cost and disruption required for partners to transition to solid-state production. The company also employs a proprietary dry-coating process to further enhance manufacturing efficiency and reduce costs. Recent milestones include securing its first commercial aerospace battery order and completing successful flight tests with partner Tulip.

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 Senior / Staff Cell Stacking Equipment Engineer to join our team in our Cheonan, South Korea, location. This person will be responsible for owning the full-cycle development, commissioning, customization, optimization, and mass production scaling of automatic stacking equipment for our Silicon Power Cell pouch cell line. The Ideal candidate will lead new stacking process equipment R&D, prototype debugging, pilot verification, and mass production iteration; deliver equipment technical upgrades, OEE & yield improvement; and build a standardized equipment management system. 

 

In this role, you will:

• Lead full-lifecycle development, commissioning, and mass-production validation of automatic stacking equipment, iterate process parameters, and complete equipment adaptation for new product launch.
• Conduct equipment review, FAT/SAT acceptance and IQ/OQ/PQ qualification, and unify precision control standards for stacking equipment.
• Upgrade and retrofit mass-production stacking machines to improve OEE, yield and line capacity, and reduce production costs. 
• Optimize stacking fixtures, protection structures and process parameters to stabilize production, improve cell consistency and support rapid multi-spec product changeover. 
• Collaborate with cross-functional teams and external vendors to promote new line startup, equipment development and technical renovation. 
• Optimize stacking machine structure, tension control, CCD positioning and compaction logic to adapt silicon anode expansion, eliminate stacking misalignment, separator wrinkles and other key defects. 
• Lead equipment technical transfer from lab/pilot EVT/DVT/PVT to mass production, identify production bottlenecks and drive sustained yield improvement. 
• Adopt 8D, DOE, SPC, and root-cause analysis to resolve typical stacking defects, drive cross-functional troubleshooting, and close CAPA for recurrent failures. 

 

We are looking for people who:

• Bachelor’s degree or above in mechanical, mechatronics, electrical automation, materials, chemical engineering, or related fields.
• 3+ years of experience in pouch cell stacking equipment development, retrofit, and production ramp-up.
• 2+ years of professional experience in stacking machine structure and control logic; skilled in precision, tension, thermal pressing, CCD positioning, and compaction parameter tuning.
• Capable of mechanical/electrical drawing reading and CAD/SolidWorks fixture design; familiar with servo control, tension system, CCD vision and temperature-pressure closed-loop systems.
• Proficient in DOE, PFMEA, Control Plan, 8D and root cause analysis; independent in equipment troubleshooting and technical optimization.
• Experienced in pouch cell stacking line NPI and mass production ramp-up projects.
• Equipped with cross-functional coordination, project management, and vendor communication abilities; competent in on-site troubleshooting and English technical documentation.
• Proficient in English for technical document reading, global meetings, and technical report delivery. 

 

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])