Aaron is a forward who made a name for himself helping Galway United to avoid relegation in 2009. The following year he signed for Bohemians as they finished runners-up to Shamrock Rovers in the Premier Division. Aaron won two FAI Cup medals in his two spells at Sligo, either side of the 2012 season when Stephen Kenny brought him to Tallaght. He scored 4 goals in 31 appearances, including the winner in the Leinster Senior Cup final. Aaron switched to St Patrick’s Athletic in the 2014 summer transfer window. He stayed with the Saints for the 2015 season and scored nine league goals. Aaron continued to find the net with 11 for First Division champions Limerick (2016) and 12 for Bray Wanderers (2017) but an injury the 28-year-old picked up in April has restricted his season.
Aaron rejoined the Hoops in July 2018.