He graduated from the National Pingtung University of Science and Technology from the Department of Tropical Agriculture and International Cooperation in 2011.
[1] In March 2016, Appi resigned as director of quarantine at the Department of Justice and Border Control.
[4][5] On 9 August 2016, Appi was made a caucus member of the Nauru Phosphate Royalties Trust Working Group.
[9] On 29 September, Appi was re-appointed to his previous positions, with the exception of deputy minister for Public Service, and was additionally appointed to as deputy minister to the Eigigu Solutions Corporation and the Nauru Regional Processing Centre Corporation by President Russ Kun.
[11] After President David Adeang was sworn in on 31 October 2023, Appi was made Minister for Education, Climate Change and National Resilience, Naoero Postal Services, and Land Management.