After moving to New Zealand in 2007, he began curling in New Zealand in 2010, and was selected to play on the national team after a runner-up finish in the New Zealand championships in 2011. De Boer led New Zealand to its best finish at the 2011 Pacific-Asia Curling Championships in recent years, winning a silver and a medal, and going to the world championships, where they finished in fifth place. However, at the 2012 Pacific-Asia Curling Championships, he led New Zealand to a less successful result, placing 6th.