As a junior Bruintjes competed at the 2007 World Junior Speed Skating Championships where she became junior world champion in the team pursuit event. Bruintjes represented her nation twice at the World Single Distance Speed Skating Championships and once at the World Sprint Speed Skating Championships for Women. At the 2008 World Single Distance Speed Skating Championships she competed in the 500 metres event (20th) and at the 2009 World Single Distance Speed Skating Championships she competed in the 1000 metres event where she finished 4th. She participated at the 2009 World Sprint Speed Skating Championships and finished 12th overall. She participated at the European Speed Skating Championships for Women in 1981. She also competed at other international competitions, including at ISU Speed Skating World Cups.