Ayeko made his breakthrough at the 2007 Summer Universiade where he was a minor medallist in both the 5000 metres and the 10,000 metres. He also made the final of the steeplechase at that event. He was a student at the Kampala International University. He had also been a double medallist at the African University Games in 2006, winning the 1500 m and taking a silver over 5000 m.