From about 1930, Steuri specialized as a Jungfrau guide. He worked as one of the Jochführer, the guides who after the construction of the Jungfrau railway were always stationed at Jungfraujoch and led tourists from there to the surrounding peaks. As a result, in his lifetime Steuri made 1139 ascents of the Jungfrau - sometimes twice in a day. In summer 1938 Steuri led the search party that discovered the body of Italian climber Bartolo Sandri, who had died along with his partner, Mario Menti, in an attempt on the north face of the Eiger. Steuri was sometime landlord of the Konkordia Hut and chairman of the Grindelwald mountain rescue.