[1] Nimiriano obtained a Bachelor of Arts degree in Community Studies and Rural Development from the University of Juba.

[2] In addition, Nimiriano "has attended several local and international media training workshops in Kenya, Uganda, Washington DC, Sierra Leone, Djibouti, Tanzania, China and India".

[2] While at university, Nimiriano wrote opinion pieces and commentaries for the now defunct Khartoum Monitor and after her studies in 2006, she joined the paper as an editorial director and subsequently, its Managing Editor.

[2] In this capacity, she represented the media during the high level Revitalized Peace Agreement Forum in South Sudan[7] In 2019, Nimiriano received 2 awards – she was named the WAN-IFRA Africa Laureate in addition to receiving the 2019 Courage in Journalism Award.

[2][8][9] She was named on 8th on Fortune magazine's 2019 list of the world's 50th greatest leaders.