He is a member of the Fa'atuatua i le Atua Samoa ua Tasi.
Masinalupe was born in Lefaga and educated at Safa'ato'a Primary School, Lefaga Junior High School and Leulumoega College.
[1] He was first elected to the Legislative Assembly of Samoa in the April 2021 Samoan general election, winning the seat of Lefaga and Faleaseela.
[2] On 28 July 2021 he was appointed Associate Minister of Customs.
[3] On 17 January 2025 he was fired as an associate minister by prime minister Fiamē Naomi Mataʻafa after supporting her expulsion from the FAST party.