Office Management (m/w/d)

Coordinate the office daily operations, including managing the call center, processing mail, and handling correspondence. Plan schedules and travel, while greeting and supporting customers and business partners. Create proposals, order confirmations, and delivery notes within the ERP system, and manage invoicing and verification. Maintain master and project data, communicate with clients, suppliers, and internal departments, and support the technical team financially. Execute purchasing processes and control incoming goods and invoices. Prepare accounting documents for external bookkeeping. Work part-time (16–20 hours) Monday through Thursday or Friday from 08:00 to 12:00. Requires a commercial qualification and strong MS Office skills.