Aritec New Materials AG is looking for an experienced Part-Time Accountant to support the finance function at headquarters and across selected subsidiaries. The role is designed for a senior accounting professional seeking a flexible workload of 10%–30%, with home office possible, but physical presence in the office required once or twice per month. Tasks • Review AR/AP with the accountants of our subsidiaries on a weekly basis. • Support preparation and follow-up of Swiss VAT declarations on a quarterly basis. • Support HQ expense accounting and related reviews. • Support periodic P&L review and financial analysis. • Support selected German VAT declarations. • Support with yearly book closing activities & Swiss tax declaration processes. • Coordinate with external accountants, tax advisors, and internal stakeholders as needed. Requirements • Swiss accounting experience is absolutely required. Applications without Swiss accounting experience will not be considered. • Ideally more than 10 years of professional accounting experience. • Strong hands-on knowledge of Swiss accounting principles and practical finance processes. • Solid experience with Swiss VAT declarations and compliance requirements. • Experience supporting annual closing, tax declaration processes, and management reporting. • Experience working with international entities or subsidiaries is an advantage. • Experience with German VAT matters is a plus. • Structured, reliable, and able to work independently. • Good communication skills in an international business environment.