Afi signed full terms with Indera not long after and has won two league championships with them.[4] After four seasons, he transferred to Kota Ranger FC. He scored his first goal for the Rangers in the penultimate game of the season, a 1–1 draw with MS PDB on 18 February 2018. He was appointed club captain from the 2018-19 season, then led the team to winning the 2018-19 Brunei FA Cup on 22 April 2019 in a 2–1 victory.[5]
Afi exited Kota Ranger after three years and signed for Kasuka FC in June 2021. In the following year, he played in the final of the FA Cup, losing 2–1 to brother Wafi's team DPMM FC.[6] He then won the 2023 Brunei Super League with his side undefeated in 16 matches.[7]
After Kwon Oh-son was reinstated as the national team head coach, he re-utilized Afi who had played regularly for him for his first match back at the helm at the 2016 AFC Solidarity Cup held in Kuching, Malaysia.[13] Afi became the regular centre-back for fourth-placed Brunei in the tournament, appearing in four matches overall.
On 11 September 2023, Afi was given a starting berth for the away friendly against Hong Kong and played for 70 minutes until he was substituted by Hazwan Hamzah, the hosts were cruising 7–0 at that point.[16] He was selected for the 2026 World Cup qualification games versus Indonesia but saw no game time.[17]
Afi has three brothers who are also footballers.[19] Younger brother Wafi Aminuddin has eight caps for the national team.[20] Another brother Ulfi Aminuddin was a Brunei under-18 international and has represented the country in futsal, he is also captain of Brunei's seven-a-side football team.[21][22][23] The youngest brother, Bazli is a Brunei youth international.[24]