The core activity of NIEDERER ALL IN 1 Service GmbH is the provision of services in the areas of accounting, bookkeeping, and human resources for small and medium-sized enterprises (SMEs) in Switzerland. This includes, in particular: Coaching and training in the use of Swiss21 apps (AbaNinja, AbaSalary, AbaClik, Swiss21 Shop, and DeepCloud); accounting services (supplier management, VAT returns, annual financial statements including tax returns); personnel management (payroll accounting, management of social insurance, sickness and accident reports); website development for company websites; private tax returns; business consulting (succession solutions, interim management); and certification as a Swiss21.org Digital Coach. The company also offers online courses to train customers to manage their own accounting.