[1] Following her win, Nissen was signed to Universal Music Group and lists her influences as Celine Dion, Mariah Carey, Whitney Houston, Christina Aguilera, Toni Braxton and Stevie Wonder.

[8][9] Throughout high school Anja was part of the exclusive Talent Development Program (TDP) and competed in a number of singing competitions.

In 2008, Nissen made it to the semi-finals of Season 2 of popular talent-search TV show, Australia's Got Talent, aged 12.

[10] Since then she has appeared on a number of TV shows, including Young Talent Time, Mornings with Kerri-Anne and the annual Schools Spectacular.

Immediately following her win on The Voice, Nissen was due to release the track titled "My Girls", co-written by Delta Goodrem,was cancelled at the last minute.

[15] On 19 May 2015, Nissen released her follow-up single of Bacharach and David's "Anyone Who Had a Heart" as a part of Nine Network's hit television program Love Child.

[19][20] The song was written by Danish Eurovision winner Emmelie de Forest, producer Rune Westberg, and American singer and songwriter MoZella.

[21] The following year, she returned to the Dansk Melodi Grand Prix with the song "Where I Am", which was written by Nissen herself, along with Angel Tupai and Michael D'Arcy.

As of 2017, Nissen is living in Los Angeles, where she is studying Keyboard Technology and Music Theory at Musicians Institute (Hollywood).