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Sari Leppänen has previously worked as the Chief Information Officer of 3 Step IT Group (2017–2021), and before that she has held various leadership positions in Telia Group and TeliaSonera (2013–2017) and in Nokia (1995–2012).

Sari Leppänen has been a member of VTT Advisory Board for ICT & Electronics Industry (2016–2017).