Mimosa Yashir was born on 17th October 2003 in Yumbe District. At the time it was under Arua District and attended most of his primary school from his place of birth. He started his career with fourth division side Yumbe Heroes Soccer Academy in 2017/18.
Once he turned 16 in 2018/19, he joined Onduparaka JT and captained the team in the FUFA Junior League where he scored one goal in three appearances.
Yashir is a highly skilled and talented teenager capable of playing both as an attacking midfielder or winger. He joined Arua Hill SC from Onduparaka JT in 2020.