In 2018, he won the IFSC Climbing World Cup in competition bouldering.

[1] In 2016 Jernej completed the 9a+ (5.15a) graded deep-water soloing route Es Pontàs in Mallorca.

[3][4] In September 2018, he managed to get the first ascent on the boulder, Metafizika, near Celje, Slovenia.

[5][6] On 31 December 2018, Jernej made the first ascent of Dugi rat at the crag Vrulja close to Omiš in Croatia.

With a grade of 9a+ (5.15a) it is the hardest sport climbing route in the country.