His father works in Bhubaneswar as a section officer in the education department of the state government and his mother is a housewife.

[5] Mallick came into limelight after winning gold medal at the National Open Athletics Championships at Ranchi in 2013 by recording 21.22 seconds.

In 2014, he trained for four months under Glen Mills, who coached Usain Bolt and Yohan Blake, at the Racers Track Club in Kingston.

The training which costed ₹16 lakh was funded by his father, the state association and some sponsors, and helped him change his running technique.

He bettered the previous national record of 10.30 seconds jointly held by Anil Kumar Prakash (2005) and Abdul Najeeb Qureshi (2010).