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, the first to earn UN 38.3 certification for automotive-sized solid-state cells, and the first to deliver B-samples of automotive-sized solid-state batteries to major OEMs. 

The Opportunity 

We are looking for a Director of Cell Product Development who will be responsible for Factorial's next generation cell product development and cell technology. This is a full-time, on-site position based in South Korea. The successful candidate will assume a cell engineering and development role joining Factorial's team in South Korea. Responsibilities include managing multiple cell design teams, each of which is responsible for developing a different cell, and finalizing the design for handoff to manufacturing. Duties for this position include defining the cell bill of materials, cell drawing, and ensuring that the cell achieves all requirements. The preferred candidate will have a track record of product development, an understanding of Tier-1 automotive, the battery industry, as well as the research community. The candidate will also have a history of leading and developing strong teams of scientists and engineers. This position will report to the engineering division of Factorial Energy. 

Duties and Responsibilities 

Duties and responsibilities include, but are not limited to: 

• Lead the team members to design and develop the next generation battery 

• Lead the product development with experience including concept, design, and product validation (CV, DV, and PV) 

• Lead the team for Advanced Product Quality Planning (APQP) or similar product development process 

• Execute formal root cause analysis to create mitigation plans for design improvement 

• Execute Design for Manufacturing (DFM) 

• Lead the Failure Mode Effects Analysis (FMEA, DFMEA, PFMEA) 

• Demonstrated record of technical innovation, including publications, presentations, and/or patents 

• Design, validate, and analyze lithium secondary battery for continuous improvement to processes and equipment 

• Key member for large cell next-gen fabrication process development and optimization of product design for manufacturing and quality 

• Provide engineering support to project teams to resolve production and quality issues 

• Lead the effort on design-for-cost and value-added value-engineering (VA/VE) 

• Collaborate and communicate with internal customers directly on cell development 

• Support Factorial's Quasi-Solid State (FEST) Batteries Scale-Up and Mass Production 

• Work with external suppliers and internal production teams to meet design capabilities based on manufacturing processes 

• Quick response to OEM customers 

• RFQ/RFI preparation 

• Close communication with the production team 

Qualifications 

• 5+ years of experience in silicon or Li metal chemistry related lithium-ion battery product development from an established cell supplier or automotive OEM; silicon cell development experience is mandatory 

• 2+ years of management or leadership experience 

• Experience in mass production of lithium batteries 

• Good written and basic verbal communication skills in English 

• Fully located on-site in South Korea, working closely with the US team (requiring occasional late-night overlap) 

• Ability to take team feedback and incorporate it into designs, as well as give constructive feedback to others 

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, the first to earn UN 38.3 certification for automotive-sized solid-state cells, and the first to deliver B-samples of automotive-sized solid-state batteries to major OEMs. 

The Opportunity

Factorial is looking for an All-Solid-State Battery Anode Wet & SE Slurry Coating Process Engineer responsible for the wet slurry coating process and equipment development for anode and sulfide-based solid electrolyte (SE) applications. We leverage cutting-edge wet electrode manufacturing to revolutionize all-solid-state battery performance, cost, and scalability. This role requires experience in close cooperation with internal teams and external partners. This candidate will be involved from the beginning of process optimization for R&D projects, pilot line scale-up, and through to low/high-volume production. The candidate must demonstrate excellent written and verbal communication skills to facilitate efficient communication between various departments/vendors.

Duties and Responsibilities 

Duties and responsibilities include, but are not limited to: 

All-Solid-State Battery Anode Wet & SE Slurry Coating Process Development

• Lead R&D efforts to design, optimize, and scale wet slurry coating processes for ASSB anode and sulfide SE applications.
• Develop novel slurry formulations and coating strategies to enhance electrode-electrolyte interfacial compatibility, ionic transport efficiency, and cycling stability.
• Establish critical process parameters (e.g., slurry dispersion, viscosity control, coating speed, drying profiles) to meet all-solid-state battery performance specifications.
• Address key wet coating challenges specific to ASSB: solvent selection, slurry sedimentation, SE-solvent compatibility, and interfacial side reaction control.

Quality & Yield Improvement

• Identify root causes of wet coating defects (e.g., pinholes, thickness non-uniformity, cracks, lithium dendrite penetration) and implement corrective actions.
• Utilize statistical analysis (SPC, DOE) to drive yield improvements and reduce process variability.
• Collaborate with PD/QA to define testing protocols and quality standards for wet-processed all-solid-state electrodes.

Production Efficiency & Scalability

• Optimize manufacturing workflows to increase throughput and reduce unit production costs.
• Design experiments to validate process scalability from lab to pilot line to mass production.
• Troubleshoot equipment/process issues to minimize downtime.

Next-Generation Equipment Development

• Partner with equipment vendors to conceptualize, prototype, and validate next-gen wet coating electrode machinery.
• Define technical specifications for new equipment (e.g., vacuum-integrated drying systems, solvent recovery units).
• Drive innovation in automation, in-line monitoring, and Industry 4.0 integration.

Must Have Qualifications

Technical Expertise:

• 3+ years of hands-on experience in wet electrode coating manufacturing for lithium-ion batteries, sulfide electrolyte system experience highly preferred.
• Deep knowledge of wet process steps: slurry preparation (dispersion, deaeration), precision coating (doctor blade/slot-die), vacuum drying, calendaring, and lamination.
• Proficiency in material characterization (SEM, XRD, adhesion testing) and data analysis tools (JMP, Minitab).

Process & Quality Tools:

• Mastery of DOE, SPC, FMEA, and Six Sigma methodologies.
• Experience scaling processes from R&D to high-volume production.

Equipment & Innovation:

• Proven ability to collaborate with equipment suppliers on custom solutions.
• Familiarity with ASSB-specific process challenges (moisture control, interfacial stability, mechanical pressure sensitivity).

Education & Collaboration:

• Master's in chemical/Materials/Mechanical Engineering or related field.
• Strong cross-functional skills to work with R&D, production, and supply chain teams.

Nice to Have Qualifications

Preferred Qualifications:

• Hands-on experience with sulfide solid electrolyte systems or halide electrolyte systems.
• In-depth understanding of binder systems (PVDF, CMC/SBR) and conductive additives behavior in wet coating processes.

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, the first to earn UN 38.3 certification for automotive-sized solid-state cells, and the first to deliver B-samples of automotive-sized solid-state batteries to major OEMs.

THE OPPORTUNITY  

We are looking for a Manager / Sr. Manager / Director, Process Development who will lead the equipment engineering and process development function for Factorial’s whole-cell FEST manufacturing operations in South Korea. Own the full lifecycle of FEST cell-process equipment — concept, design, pilot-line deployment, production ramp, and standardization — and partner with cell product development, manufacturing, quality, and R&D to translate breakthroughs into scalable, production-ready processes.

DUTIES AND RESPONSIBILITIES  

Duties and responsibilities include, but are not limited to:  

• Equipment development: Define specifications, performance requirements, and acceptance criteria; partner with vendors to design and procure custom tooling and automation; drive continuous improvement of yield, throughput, and process capability. 
• Pilot-line upgrades: Assess pilot-line capabilities versus production requirements, develop upgrade roadmaps, and manage projects through installation, qualification (IQ/OQ/PQ), and sign-off with minimal disruption.
• New equipment introduction: Monitor industry advances, lead proof-of-concept evaluations, and pioneer proprietary equipment for FEST processes where no off-the-shelf solution exists. Manage IP protection for novel innovations.
• Trial runs and capacity ramp: Plan trial runs, define success criteria, coordinate cross-functional readiness, and lead systematic process qualification and capacity ramp aligned with OEM program milestones.
• Documentation and standardization: Develop SOPs, work instructions, and knowledge-management systems; standardize FEST manufacturing processes across pilot and production lines for repeatability, traceability, and automotive-grade quality readiness.
• Team leadership: Build and mentor a high-performing technical team; champion engineering rigor, continuous improvement, and cross-site knowledge sharing. 

QUALIFICATIONS  

• Must have direct hands-on experience building small-format pouch cells for UAV/drone applications. Candidates must have led or substantially contributed to the development and manufacturing of small-format lithium-based pouch cells specifically deployed in unmanned aerial vehicles (UAV) or drone platforms. Candidates without demonstrable UAV/drone small-format pouch cell experience will not be considered.
• Bachelor’s degree or higher in Mechanical Engineering, Chemical Engineering, Materials Science, or a related field; advanced degree preferred.
• 5+ years of experience in battery manufacturing process and equipment development; experience with FEST cells, small-format pouch cells, or dry-electrode processes strongly preferred.
• 5+ years in a management or technical leadership role overseeing equipment engineering or process development teams.
• Demonstrated experience with full equipment lifecycle management: concept, specification, procurement, installation, qualification (IQ/OQ/PQ), and ramp.Proven track record in pilot-to-production scale-up and capacity ramp.
• Strong written and verbal communication skills in English are required. This role works closely with the U.S. team; English is the primary working language. Korean language ability is not required.
• Fully on-site in South Korea, with occasional late-night overlap to align with U.S. counterparts.
• Familiarity with automotive quality frameworks (IATF 16949, APQP, PPAP) preferred. 

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:

We are seeking a motivated Cell Test Engineer with more than 4 years of experience in cell testing to support our rapidly growing solid-state battery development company. This role will be responsible for cell testing validation, protocol development, data processing and analysis. The ideal candidate will have experience in cell testing, and capable of interpreting test plans, and collaborating with the development team to complete cell qualifications.

Key Responsibilities

• 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

Qualifications

• 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

What We Offer

• Opportunity to work in a cutting-edge solid-state battery technology company
• Collaborative and international working environment
• Competitive compensation and career growth opportunities

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:

We are looking for a Senior / Staff Power Cell Development Engineer who will be responsible for Factorial’s next-generation cell product development and cell technology. The successful candidate will assume a cell engineering and development role and join Factorial’s team in South Korea. This role will execute new platform development for silicon-based drone cells and LMB power cells in accordance with the technical roadmap, including material, formula, and process evaluations to enable product realisation. The role involves designing cell products according to customer requirements and validating performance, including electrochemical and safety performance, while driving continuous optimization. The engineer will lead NPI activities and be responsible for preparing and releasing all related documentation, including BOMs, DFMEAs, and a sample-building index. The role will participate in technical discussions with customers related to new product development programs and support battery material development, including cathodes (high-nickel NMC), anodes (graphite with silicon-based materials and lithium metal), separators, binders, and current collector foils, while also supporting other internal departments on cell product–related technical issues.

Duties and Responsibilities for the power cell development engineer (cover Si drone and LMB power cell):

• Base on the technical roadmap to conduct the new platform development including the material, formula, process evaluation to make it come true.
• Base on the customer requirements to design the cell products. And validate the performance including electrochemical/safety performance, then conduct the continuous optimization.
• Lead the new produce NPI, Responsible for all the related documents preparation and release, including the BOM, DFMEA and sample building index,
• Follow up the sample building and solve the issue, lead the FA
• Join the discussion with customers about the new product development-related topic.
• Support battery materials developments, for example: cathode (high Ni NMC), Anode (graphite+SiC, Li metal), Separator, new binder, collector foil etc.
• Support the other departments for the cell product related issues.

Requirements:

• At least mater degree
• At least 3years of power cell or drone cell product development experience. Know the lithium-ion battery and lithium metal battery very well. Can lead the product development independantly.
• Good FA/problem solving/data analysis capability
• Good communication with English.
• Rich experience for customer communication.

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)