He left the NBC and worked for a period as a government liaison officer for the Bougainville restoration team before becoming the New Guinea Islands bureau chief for newspaper The National from 1994 to 1999.
Masiu worked as a media officer for then-Bougainville Governor John Momis before joining the office of East New Britain Governor and later Deputy Prime Minister Leo Dion as first secretary.
[1][3] He has also served as deputy chairman of the National Broadcasting Corporation, chairman of the Vunamami Farmers' Training Centre, Bougainville team manager for the Papua New Guinea Games and co-ordinator of the "Katim Na Halivim Pikinini" children's health project.
[4][5][6][7][8] He was the unsuccessful Melanesian Alliance Party candidate for the South Bougainville seat at the 2012 election.
[9][3] Masiu was elected to the National Parliament for the People's Progress Party at a July 2016 by-election caused by the death of MP Steven Pirika Kama.