Keimuine started his career at Tura Magic, and in 2012–13 season helped them in an important relegation battle by scoring in a 3–1 win against Mighty Gunners.
[2] On 30 September 2018, he joined Ethiopian side Dire Dawa City, thus becoming the first Namibian player to play in Ethiopia.
[3] Keimuine was called up for the Namibia U20's for the 2013 African U-20 Championship qualification, but were knocked out in the preliminary round, after losing 4–1 on aggregate to Rwanda.
[5] On 1 September 2014, Keimuine got his first national callup after he was named in Namibia's 23-man squad by coach Ricardo Mannetti, for a friendly against Swaziland.
[12] In Namibia's opening match against Morocco, he finished Hakim Ziyech’s well-placed cross past his own goalkeeper just 10 minutes after coming on, thus scoring an own goal.