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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 Formation Process Engineer/ Senior Engineer  to join our team in our Cheonan, South Korea location. This person will be responsible for  the development, optimization, and mass-production support of formation and grading processes for our Silicon Power Cell line. This role covers the full formation lifecycle — from R&D validation through pilot scale-up to high-volume manufacturing — with a focus on silicon anode-specific formation protocol development, SEI stability, and high-rate capability optimization. The ideal candidate brings deep electrochemical engineering  expertise , hands-on formation equipment experience, and a data-driven approach to process improvement and yield stabilization.     In this role, you will: Lead development and optimization of formation protocols for Si-based power cells, including pre-formation, standard formation, and step-charge strategies tailored to silicon anode expansion behavior Design and validate formation recipes (charge/discharge C-rates, temperature windows, cutoff conditions) to maximize ICE, SEI film uniformity, and suppress lithium plating risk on high-Si anodes   Establish capacity grading specifications defining key binning parameters including capacity, DCIR, and self-discharge rate Develop product-specific formation programs  optimized  for high-rate power cell requirements     Develop formation protocols that account for silicon anode volume expansion during  initial  lithiation, minimizing mechanical stress and SEI instability   Collaborate with R&D and electrode teams to correlate formation conditions with Si anode first-cycle efficiency, swelling behavior, and long-term cycle stability   Identify  root causes of formation and grading anomalies and implement CAPA actions   Apply SPC, DOE, and FMEA methodologies to reduce batch-to-batch variation and improve process capability ( Cpk )   Partner with QA/QE to define inspection standards for the formation segment   Optimize  formation line takt time and OEE, reducing energy consumption per cell and WIP inventory   Drive process transfers across all development stages: lab bench → pilot line → mass production   Develop and  maintain  PM plans for formation equipment to minimize unplanned downtime   Collaborate with formation cycler suppliers to define equipment specifications   Lead FAT/SAT acceptance testing for formation equipment and establish OQ/PQ qualification protocols   Support MES data integration and in-line monitoring for smart manufacturing capabilities   We are looking for people who: Have 3+ years of hands-on experience in lithium-ion battery formation and grading processes   Have experience with silicon anode or high-energy-density cell formation preferred   H