He sits on the Supreme Court of Samoa, and was the first Pacific Islands judge appointed to the United Nations Committee on the Rights of the Child.
[5] In 2014 Vui became the first Pacific Islands judge appointed to the United Nations Committee on the Rights of the Child.
[7] In this role he criticised the Samoan government's attempted re-introduction of corporal punishment in schools.
[8] In 2019 following the retirement of Patu Tiava'asu'e Falefatu Sapolu he was appointed acting Chief Justice of Samoa.
[9] He served in that role for almost a year before the appointment of Satiu Simativa Perese as Chief Justice in March 2020.