Ulimwengu impressed at the soccer academy and was soon called up to the Tanzania U-17 national team.
After his good performance in the competition, he was regularly called up by coach Marcio Maximo to practice with the senior national team, the Taifa Stars.
In the 2009–10 Tanzania Premier League season Ulimwengu played on-loan for Moro United.
The following summer, he represented Tanzania in the 2010 Copa Coca-Cola African Championship in South Africa,[3] where he scored nine goals in five matches.
[2] On 31 August 2011 Ulimwengu joined 4-time African Champions League winners TP Mazembe.