He attended the National University of Rwanda and graduated in 2011 with a Degree in Applied Statistics. He studied filmmaking as a short course, and his first project was a documentary called "One Day of a Blind Student".
His family returned to Rwanda in 1994 when he was nine years old. Gahizi’s childhood dream was to help vulnerable people, especially those affected by the Genocide. The story follows a blind man who enters university despite his belief that disability will prevent him from succeeding in higher education.
The documentary received multiple national awards.
Gahizi, a genocide survivor, lost almost all of his relatives in the 1994 genocide against the Tutsi. Gahizi"s interest in changing and empowering their lives took the form of the Best Hope Rwanda Charity.
The Charity’s mission is the improvement of their psychosocial, medical, educational and economic support to facilitate their reintegration into the community and to increase their self-reliance. On 5 and 6 December, 2013, Gahizi was invited by the president of the republic of Rwanda Paul Kagame to attend the National Dialogue.