Reds Paenga-Amosa was reported to have been in and out of the
New South Wales Waratahs program while playing for the
Southern Districts in the
Shute Shield, the club he began his senior career with. His strong scrummaging and physical presence earned attention at higher levels, and was later picked up by the
Greater Sydney Rams in the
National Rugby Championship (NRC). After one season (
2016) with the Greater Sydney Rams, Paenga-Amosa was picked up by rural-based New South Wales club, the
New South Wales Country Eagles for
2017. He appeared in all eight of the Country Eagles' fixtures for the season, and scored a hat-trick in the final match of the season against
Brisbane City, which finished 38-all. Ahead of the
2018 Super Rugby season, Paenga-Amosa was offered a position with the
Melbourne Rebels in their wider training squad. new coach
Brad Thorn offered Paenga-Amosa a two-year contract, to which he signed. Months later, reflecting on his move to the Reds, Paenga-Amosa stated: "I was kind of star struck, having this idol of mine [Brad Thorn] call me, asking me if I wanted to come up to
Brisbane. As soon as I spoke to him, I jumped in the car and drove to
Queensland." Early into the season the Reds pulled off two major wins against dominant scrummaging sides: rivals the
Brumbies, and the
Pretoria-based
Bulls. Paenga-Amosa played a further sixteen games for the Reds in their following season (
2019), although only starting in six. He scored five tries, one more than the previous season. At the end of the season Paenga-Amosa signed a two-year contract extension. This injury occurred just as he was poised to reclaim the starting hooker spot from
Alex Mafi, after a strong off‑season. Early in the 2021 season, Paenga‑Amosa was sidelined with a neck injury, delaying his squad involvement until
round four of the
2021 Super Rugby AU season. Post‑injury Paenga‑Amosa notably helped restore some stability to the hooker position and restore depth to the Reds' forward pack. Australian sports website,
The Roar, suggested that set‑piece execution (especially lineout throwing) was an area where the Reds hoped Paenga‑Amosa could contribute improvements when healthy. In his first season with Montpellier, he made seventeen appearances in all competitions, including thirteen in the
Top 14, starting in six. Montpellier won 29–10 in what was their first French title since being established in 1986. In the following season
2022–23, Paenga‑Amosa's role increased. He played twenty-four matches for Montpellier in all competitions, of which nineteen were in the Top 14, and was a starter in twelve of those Top 14 matches. He mentioned being more exposed to the French tight‑head players who "take that angle", try to break the seam between the loose‑head prop and hooker. He said his exposure in French rugby forced him to raise his technique. His recruitment was part of a wider forward‑pack strengthening strategy for the Force, which included additions such as
Nic Dolly,
Harry Johnson-Holmes,
Darcy Swain,
Will Harris, among others. In an interview with
Rugby.com.au, Paenga-Amosa said that his time in France and his experience as a father have contributed to increased composure, better preparation for contests, and greater leadership in tight phases; with
Green and Gold Rugby (GAGR) commenting on a "wealth of experience and renewed sense of purpose" Paenga-Amosa would now bring to the
Super Rugby after his stint in France. Paenga-Amosa played seven matches for the Force in 2025, scoring two tries. ==International career==