ZSC Lions
Boltshauser was originally part of the ZSC Lions organization as a junior before signing in the Swedish Hockey League with Färjestads BK. Boltshauser played in the J20 SuperElit competition for Färjestads, however never made his SHL debut. He was loaned to HockeyAllsvenskan club, VIK Västerås HK, before returning to the ZSC Lions for the 2014–15 season.