In her career, Efremova won eleven titles on the ITF Women's Circuit, one in singles and ten in doubles.

In 2003, Julia tried to qualify for her first WTA Tour event in Moscow but fell to Anastasia Rodionova in the first round.

In 2005, she played the qualifying draws of five tournaments (Pattaya, Hyderabad, Beijing, Guangzhou and Tashkent) but was unsuccessful in each.

In 2007, she fell in the qualifying draws of Kolkata and Moscow, losing to Sandy Gumulya and Oxana Lyubtsova, respectively.

Julia's biggest title of her career was winning the Busan Challenger doubles event in 2005, partnering with Wynne Prakusya and defeating Seiko Okamoto and Ayami Takase in the final.