Kammala wannan jumla: An haife shi a Owando, Ondongo na cikin kabilun Kouyou. Ya fara aiki a Jami'ar Marien Ngouabi da ke Brazzaville a shekarun 1980. Bayan da Denis Sassou Nguesso ya koma mulki a cikin
Yuni-Oktoba 1997 yakin basasa, ya nada Ondongo a matsayin mai ba da shawara ga Shugaban kasa kan Tattalin Arziki, Kudi, da Kasafin Kudi; Ondongo ya yi aiki a wannan mukamin daga 1997 zuwa 2002. Daga nan aka nada shi a cikin gwamnati a ranar 18 ga Agusta 2002 a matsayin Sakataren Gwamnati don Gyara Kasafin Kudi da Gudanar da Kudi, yana aiki a karkashin Ministan Tattalin Arziki, Kudi, da Kasafin Kudi. An daukaka shi zuwa matsayin Ministan Ayyuka, Ayyuka, da Tsaron Tsaro a ranar 7 ga Janairu 2005.