She holds the current Indian national record in 400 meters with a timing of 50.79 s that she clocked at the 2018 Asian Games in Jakarta, Indonesia.

At one of the inter-school camps held at the nearby Jawahar Navodaya Vidyalaya (JNV), she would arrive at the ground before practise began, and sometimes even before the gates were opened.

[3][15] On 12 July 2018, Das won the 400 m final at the World U-20 Championships 2018 held at Tampere, Finland, clocking 51.46 seconds and becoming the first Indian sprinter to win a gold medal at an international track event.

[19] Das continued her success in 2019 winning the 200m gold in Poznan Grand Prix in Poland, on 2 July 2019, with a time of 23.65 seconds.

However a month before, she was ruled out of participation due to a back problem, that had started right after she competed at the Asian games the previous year.