Ali Messaoudi first competed in the national obstacle course championships in 2014. He finished fourth in June. A month later he moved into the final of the U20 World Championships in Eugene. In the final he ran a little faster than in the prelim and finished eighth in 8: 45.20 minutes. In 2015 he became Algerian runner-up in the obstacle course. In June he ran the season best of 3: 36.23 min. In early June 2016, Messaoudi competed at the U23 Mediterranean Games in Tunisia, where he won the gold medal. At the end of the month he ran a time of 8: 27.99 minutes in Algiers, which has since been recorded as his personal best. This enabled him to qualify for the Summer Olympics in Rio de Janeiro. There he competed in August after becoming the Algerian champion over the 3000 m obstacle for the first time in July. In Rio he was seeded in the first of the three prelims, but he was disqualified after a technical error after crossing an inside marking. In 2017 he joined the Universiade in Taipei as a student at the University of Algiers . He ran a time of 8: 37.14 minutes, with which he won the bronze medal.
During the Islamic Solidarity Games , to which Messaoudi competed in Baku in May 2017, the prohibited substance stanozolol was detected in a doping test . He was then suspended for four years until 2021, and all results achieved since evidence, including the bronze medal from the Universiade, were revoked. The Algerian Athletics Federation should not always obey the bans. The Ministry of Sports is said to have issued instructions to halve Messaoudi's suspension to two years.