Senior Cell Test 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, and the first to deliver B-samples of automotive-sized solid-state batteries to major OEMs.

 

The Opportunity:

Factorial Energy is seeking a Cell Test Engineer to join our team in Cheonan, South Korea. This person will be responsible for managing the Lab and leading the test validation for all projects. The ideal candidate will have experience in cell testing validation, protocol development, data processing, analysis, and be capable of interpreting test plans, and collaborating with the development team to complete cell qualifications.

 

In this role, you will:

• Developing and optimizing the cell testing system, including processes, standards, specifications, use cases, DVP, report templates, etc
• Coordinating with customers regarding testing standards, plans and schedules
• Following up on cell testing, including conducting tests, analyzing results, resolving testing issues and supporting the cell development team in failure analysis
• Organizing and analyzing cell data, reviewing test reports, establishing a cell database, and compiling automated data processing scripts
• Tracking and interpreting international standards and regulations, and benchmarking against industry-leading testing standards
• Managing the testing laboratory and maintaining testing equipment, and planning annual testing requirements
• Develop new testing schemes

 

We are looking for people who:

• Master’s degree 
• More than four years of relevant experience in cell testing, be familiar with the cell performance testing process and methods, understand the testing standards and safety regulations
• Able to quickly understand various testing requirements and possess the ability to convert requirements and write test plans, and implement testing work
• Data analysis skills and be proficient in using data processing software to generate test reports
• Familiar with the operation and data management of cell testing equipment (such as Neware, etc.), and have equipment maintenance capabilities
• Have good teamwork and cross-departmental communication and cooperation skills, and be able to effectively communicate and cooperate with personnel from different departments to promote testing progress
• Understand the working principle of lithium batteries, the mechanism of degradation and influencing factors
• Possess strong data analysis capabilities and safety awareness in cell testing, be meticulous and sensitive to data
• Fluent in English

 

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])