A high-ranking and long-time figure under President Denis Sassou Nguesso, Ntsiba initially rose to prominence through the military in the single-party regime of the Congolese Labour Party (PCT) in the 1970s.
After Sassou Nguesso regained power in the 1997 civil war, Ntsiba again returned to the government as Minister of Equipment and Public Works from 1997 to 2009.
[9] He was not included in the Central Committee elected at the PCT's July 1984 congress,[11][12] but he was politically rehabilitated in later in the 1980s and appointed to head SIACIC, the national cement company.
[5] After Sassou Nguesso returned to power in the June–October 1997 civil war, he appointed Ntsiba to the government again as Minister of Equipment and Public Works on 2 November 1997.
[16] Ntsiba was an unsuccessful candidate in Lekana constituency in the May–June 2002 parliamentary election; he was defeated in the second round of voting by fellow minister André Okombi Salissa.
In the post-election government appointed on 15 September 2009, Ntsiba was moved to the post of Minister of State for Labour and Social Security.
[22] Following the July–August 2012 parliamentary election, Ntsiba remained in his post in the government named on 25 September 2012,[23] but the system of sector coordinators was eliminated.