 Razarenova attended an elite sports school in St. Petersburg (Училище олимпийского резерва № 1) and started her international career as early as in 2005 when, at the age of 15, she took part in an ITU Elite race in Alanya.From 2006 to 2009, she attended five Junior European Cup triathlons and always achieved top ten positions, among which three gold medals.In 2009, she placed 4th in the Junior European Championships and 5th in the Junior World Championships.