[1] Ssemugabi is the last born in the family of Leonard Kasujju and agnes Nalweyiso with other six siblings.
[1] He made his debut on Uganda National team in a game against Congo on 11 September 2024 in the Africa Cup of Nations Qualifiers 2025 when he came on a substitute for Muhammad Shaban in the first half of the game to score the second goal for Uganda.
[1] He scored a brace at the start of 2024/25 in a game where Kitara beat Lugazi FC 3-0 away on Matchday one of the Uganda Premier League.
[2] In August 2018, Ssemugabi signed for Mbarara City FC after being the top scorer in the Masaza ga Buganda competitions of 2018 with Ssaza Ssingo.
[7][8] He made his debut against Congo in the Africa Cup of Nations Qualifiers 2025 when he came as a substitute in the first half for Muhammad Shaban and scored a second goal for the Uganda Cranes as Uganda beat Congo 2-0 at Mandela National Stadium, Namboole.