Teamed-up with Alfian Eko Prasetya, they emerged as the mixed doubles world junior champion, beating their compatriots Ronald Alexander and Tiara Rosalia Nuraidah in the rubber games 12–21, 21–17, 25–23 in the final.

[8] At the 2013 Indonesia Open Grand Prix Gold, they failed to advance to the final stage, had upset by the six seeded Praveen Jordan and Vita Marissa in the semifinal.

[14] Widjaja and Subaktiar made their first appearance at the semifinals of the BWF Super Series event in India Open, and at the China Masters Grand Prix Gold, they grabbed the runner-up podium.

[24] In 2019, Widjaja reached the finals of German Open with Hafiz Faizal, but they were defeated by South Korean pair Seo Seung-jae and Chae Yoo-jung in straight games.

[30] In July, she and Faizal beat the world number 1 Zheng Siwei and Huang Yaqiong in the quarter-finals of Japan Open,[31] but the duo lost to their compatriot Praveen Jordan and Melati Daeva Oktavianti in the semi-finals.

[37] Two weeks later, the duo finished as the finalist in Thailand Masters lost to English pair Marcus Ellis and Lauren Smith in rubber games.

[39] In March, they played in All England Open and lost in second round to four seeds and eventual winners Yuta Watanabe and Arisa Higashino of Japan.

[44] They later won their third consecutive title as a pair at the Vietnam Open where they defeated their compatriots Rehan Naufal Kusharjanto and Lisa Ayu Kusumawati in two games.

[46] Their winning streak was then stopped by the Chinese pair Jiang Zhenbang and Wei Yaxin in the semi-finals of the Indonesia Masters,[47] and their ranking shot to the top 50 in the world.

[50] In January, Widjaja with Ferdinansyah lost in the semi-finals of Malaysia Open from first seed Chinese pair Zheng Siwei and Huang Yaqiong.

[54] In March, Widjaja and Ferdinansyah competed in the European tour, but unfortunately lost in the second round of German Open from Hong Kong pair Lee Chun Hei and Ng Tsz Yau.

[55] In the next tour, they lost in the first round of All England Open from fellow Indonesian and club mates Praveen Jordan and Melati Daeva Oktavianti in three games.

[56] In the next tour, they had to accept first round defeats in two consecutive tournaments at the Swiss Open from fellow Indonesian pair Rinov Rivaldy and Pitha Haningtyas Mentari.

[60] In June, Widjaja and Ferdinansyah competed at the Singapore Open, but had to lose in the first round from Danish pair Mathias Thyrri and Amalie Magelund.

[61] In the next tour, they competed at the home tournament, Indonesia Open, but lost in the first round from 4th seed Korean pair Seo Seung-jae and Chae Yoo-jung .

[62] In July, Widjaja and Ferdinansyah competed at the Korea Open, but had to lose in the second round from 6th seed Korean pair Seo Seung-jae and Chae Yoo-jung for second time in a row.

[64] In early August, Widjaja competed at the Australian Open, but had to lose in the first round from fellow Indonesian pair Rinov Rivaldy and Pitha Haningtyas Mentari in rubber games.