Hojer started participating in German Lead climbing youth competitions in 2004, at the age of 10. From 2008 to 2010 he participated in the Lead Climbing World Cup. Since his performances in lead climbing were never outstanding, he quit competing in that discipline in 2011 and started competing in bouldering. Notable results started coming next year, when he ranked fifth in the Climbing World Championships. He won the seasonal title of the Bouldering Climbing World Cup in 2014 and finished second in 2015.[1]
Hojer has won national championships in all climbing disciplines. He won the lead in 2008, 2017, and 2019. In bouldering he won in 2011, 2014, 2015, and 2016, finished second in 2017, and has not competed since. Hojer won the first German National Championship in the combined format in 2018, and in 2019 he won the only discipline that he hadn't won yet, speed.
In 2019 Hojer qualified for the 2020 Summer Olympics through his performance at the IFSC Combined Qualifier event in Toulouse.[2] Hojer finished 12th out of 20 at the Tokyo Olympics.
Jour de Chasse - Fontainebleau (FRA) - December 2013 - First ascent. Hojer graded it a soft 8C, possibly because he did not use a heel hook that, according to some repeaters, makes it easier to climb.[8]
Dreamtime - Cresciano (CHE) - February 18, 2013. Rated 8C by Hojer, who described it as "much harder than any 8B+ i've ever tried.."[9]