Sales Assistant role at PT. BTR Indonesia, a lithium-ion battery materials manufacturer in Kendal, Jawa Tengah. Responsibilities include order processing, customer communication, and internal coordination: managing customer orders, arranging logistics, preparing export documents, responding to inquiries, coordinating with internal departments, and maintaining customer relationship systems using SAP/CRM. Korean language proficiency is mandatory and must be sufficient for daily work; English or Chinese language skills are an advantage. Qualifications: Bachelor's degree; 1+ years relevant experience preferred; proficiency in Microsoft Office; strong attention to detail and numerical accuracy. Willingness to work overtime on weekdays and weekends.