Aaron Tumwa played on trial for Norwich City's Under-21 development squad against West Ham on 28th September 2012, which the young Canaries lost 2-0. He has previously played for Watford and Harrow Borough (loan).

He was released by Watford in May 2013 and signed for Blackburn on 19th August 2013, following a successful trial at left-back and centre-back.

Tumwa was released by Blackburn on 16th May 2014. He trialled with Tranmere Rovers in the summer of 2014 before joining Farnborough in August 2014.

In July 2015 Tumwa signed for Conference National club Bromley. After making five league appearances, he joined Hayes & Yeading United on loan in March 2016. In June 2016 he joined Margate from where he was loaned to Hendon., In 2017, he signed for Bishops Stortford.

He was capped by Antigua and Barbuda for the first time in November 2014 against Haiti.