[2] When she was 12 years old, Tandon was spotted at a state meeting, and was selected to compete in two national events, and won a bronze medal.

[1] At the 2001 28th junior National aquatic championship, Tandon won the 200 m individual medley, setting a new record.

[4] At the 57th Senior National Aquatic Championship in 2003, Tandon broke the Indian women's 50 freestyle record, with a time of 26.61 s.[5] She won five individual gold medals in the competition, and was declared best swimmer for the third consecutive year.

[9] [10] In the same year, she became the first female Indian to win an international medal for a short-course event, taking bronze at the indoor Asian age-group swimming Championships in Bangkok.

[1] She completed her dual master's degree in Biology and Biotechnology from Case Western Reserve University, Ohio and is currently working as Science Program Lead at US Antidoping Agency, Colorado Springs, USA.