Jang won her first ITF Circuit title in Bundaberg, Australia in March 2013, winning the doubles tournament alongside Lee So-ra, defeating Miki Miyamura and Varatchaya Wongteanchai in the final in three sets.

[citation needed] At the 2013 Korea Open she reached the quarterfinals with a three-set win over Ons Jabeur[1] Jang lost in the last eight to Lara Arruabarrena.

[5] Playing with Han Na-lae, she won the doubles title at the 2023 WTA 125 Veneto Open, defeating Weronika Falkowska and Katarzyna Piter in the final.

[6] Alongside You Xiaodi, Jang reached the final at the 2022 WTA 125 Argentina Open, losing to Sara Errani and Irina Bara.

[7] Partnering Eri Hozumi, she was runner-up in the doubles at the 2023 Swedish Open, losing to Misaki Doi and Rebecca Peterson in the final.