The following year Jomni travelled to Doha to compete at the 2015 IPC Athletics World Championships. He entered four events, the 100m, 200m, 400 m and 800 m races all in the T53 classification. He qualified through the heats of all four events to reach the finals, achieving a bronze in the 200 metres final. The following year, in the build-up to the Summer Paralympics in Rio, Jomni travelled to Grosseto to take part in his second European Championships. At the Championships, despite losing his 400m title to Russia's Vitalii Gritsenko, he still finished as one of the British team's most successful athletes with five medals. Jomni won a bronze medal in the 100m, silvers in both the 400m and 800m and gold medals in the 200 m and 4 x 400m relay. In the relay Jomni shared the win with his club mentor and team-mate David Weir, alongside Richard Chiassaro and Nathan Maguire.