Since 2007, Aminuddin had represented
Muara Vella for club and youth level. He ended his association with the
Muara side in 2014 when he joined
Najip FC. Aminuddin was added to the local contingent of the
DPMM FC squad for the
2015 S.League season in February 2015 along with
Reduan Petara,
Yura Indera Putera and
Khairul Anwar Abdul Rahim. He was the only one out of the four to give a significant contribution to his team's title-winning season, appearing 22 times mostly at right-back. After managing only a single league appearance in 2017 (which was a 9–3 drubbing by
Home United on 25 May), Aminuddin was released in the close season. Aminuddin joined
Indera SC shortly after and scored in the semi-final of the
FA Cup against
Kasuka FC in March 2018. He won an FA Cup medal by beating
MS PDB in the final by 2 goals to nil. Aminuddin scored his first goal for Indera on 23 November 2018 in a 3–3 draw against MS PDB. He scored a 95th-minute equaliser against the Policemen to deny them the two points. ==International career==