[2][3] Heem began his senior rugby career with his home province Auckland and made 3 appearances during the 2010 ITM Cup season before heading north to Whangārei to link up with Northland Taniwha as a loan player.

[1] He spent 2 seasons with the Cambridge Blues and scored 5 tries in 15 appearances before heading down to the South Island to join the Tasman Mako in 2012.

[4] On 8 April 2015, it was announced Heem would move to England to join Worcester Warriors in the Aviva Premiership from the 2015–16 season.

[7] On 27 February 2019, French giants Toulon announced that they had signed Heem on a two-year deal, starting from the 2019–20 Top 14 season.

Heem represented the All Blacks Sevens side from 2011 until he signed his Super Rugby contract with the Chiefs.