- lecturer online classes with live guidance
- 2016 until now: own company Sandra de Hoog: Excel courses
- 2015-2016: iPad courses for elderly (unpaid)
- 1992 until now: employee at the Hogeschool van Amsterdam, Netherlands, department Economics and Business, both the Dutch and the international department (AMSIB=Amsterdam School of International Business):
- lecturer IT subjects, amongst others: MS-Excel, MS-Word, MS-Access, MS-Project, MS-Visio, SAP-ERP, SAP-CRM, SAP S/4HANA theory of the IT, databases, programming languages Pascal and Cobol
- secretary Test Assessment Committee
- internship coach
- thesis assessor
- coordinator sections IT and ERP-SAP
- 1991-1992: consultant computerhardware and –software, IT-department (CVI) of the Nederlandse Spoorwegen (Dutch Railways)
- 1988-1991: computerprogrammer en systems analyst, IT-department (GRC) of the municipality Rotterdam, Netherlands
- 1987-1988: lecturer computersoftware for employees and civil servants, company Verhagen in Delft, Netherlands