Born in Mutimbuzi, Burundi, Nshimirimana began playing football at the age of eight, and his father enrolled him at the local club New Regime.[1] From there, he went on to play at Delta Star in the lower divisions of Burundian football.[1] They achieved promotion into the Burundi Premier League for the 2017–18 season. Although they finished the season in last place, Nshimirimana led his team to a runner-up finish in the 2018 Burundian Cup.[2] He scored a goal in the 4–0 semi-final victory over Olympique Star, who finished fifth in the league.[3]
Nshimirimana made the move to Aigle Noir Makamba in the summer before the 2018–19 season.[1] They won their first-ever league title that year, in addition to winning their first domestic treble after also capturing the Burundian Cup and Super Cup as well as the second-ever Coupe de l'Unité.[1][4]
Yeni Malatyaspor
On 2 January 2021, in the final day of the winter transfer window, Turkish Süper Lig side Yeni Malatyaspor announced the signing of Nshimirimana on a three-and-a-half-year contract.[5]
He made his senior international debut on 27 July 2019, coming on for Landry Ndikumana in the second half of a match against South Sudan during 2020 African Nations Championship qualification. He scored in the 82nd minute of the 2–0 victory.[8] He received his next call-up ahead of the 2020 Bangabandhu Cup hosted by Bangladesh in January 2020. He scored a hat-trick in their opening match against Mauritius on January 16, which they won 4–1 after conceding the first goal.[9][10][11] He added a goal in Burundi's victory over Seychelles two days later,[12] then put up another hat-trick in their semi-final upset of the host team Bangladesh on 23 January.[13] Although they lost in the finals to Palestine, Nshimirimana was named player of the tournament after leading all scorers with seven goals.[1][14][15]