Otso Tiainen created and directed three seasons of Sami Yaffa: Sound Tracker (2014-2017) for Yle and Gimmeyawallet Productions. The music travelogue series with Sami Yaffa (of Hanoi Rocks fame) was a crossover hit in Finland and was acquired by Netflix for several territories. For the series, Tiainen received two Venla (Finnish Emmy) awards and was nominated for the Venla for best director on TV. He created and directed Meeri Koutaniemi, irti kuvasta (2021), a documentary series about visual arts and artists in Finland.
As a director of music videos, Tiainen was self-educated and early well recognized, having won his first prizes in the field already in 2002. Tiainen has directed dozens of commercials for high profile clients.