Janics won two Olympic gold medals in the sprint canoe events at the 2004 Summer Olympics, another gold and silver medal at the 2008 Summer Olympics and silver and bronze at the 2012 Summer Olympics. She has also won 26 medals at the ICF Canoe Sprint World Championships with 20 golds (K-1 200 m: 2007, 2009, 2010; K-2 200 m: 2005, 2006, 2009, 2010; K-2 500 m: 2005, 2006; K-2 1000 m: 2005, 2006; K-4 200 m: 2002, 2003, 2006; K-4 500 m: 2006, 2009, 2010; K-4 1000 m: 2003, 2006; K-1 200 m relay: 2013) and six silvers (K-1 500 m: 2010, K-1 4 x 200 m: 2009, 2010; K-2 200 m: 2015; K-2 500 m: 2013; K-4 200 m: 2009).