Collegiately, he competed for the University of Southern California under head coach Dave Salo where he won 4 NCAA titles as a part of USCs relay team.

In July 2019 at the 2019 World Aquatics Championships, which took place in Gwangju, South Korea, Carter and Simone Sabbioni of Italy had wedge equipment malfunction during their starts in the 100 metre backstroke.

[5][6][7] Officials required Carter and Sabbioni to re-swim the race alone, one at a time, after the malfunction was ruled due to the wedge apparatus failure if they wanted to compete in the semifinals.

[8] During match nine of the 2021 International Swimming League in Naples, Italy, Carter took third place in the short course 50 metre butterfly with a time of 22.36, which broke the Trinidad and Tobago national record in the event he had previously set at 22.38 seconds in 2018.

[10][9] On 20 December 2021, Carter won the silver medal in the 50 metre butterfly in a Trinidad and Tobago record time of 21.98 seconds at the 2021 World Short Course Championships held at Etihad Arena in Abu Dhabi, United Arab Emirates.

[14] At the 2022 World Aquatics Championships, held at Danube Arena in Budapest, Hungary with swimming competition in June, Carter placed fourth in the 50 metre butterfly with a Trinidad and Tobago record time of 22.85 seconds and place fourteenth in the 100 metre freestyle with a Trinidad and Tobago record time of 48.30 seconds.

[18][19] Day three, he won a third gold medal, this time finishing first in the 50 metre butterfly with a 22.13, which was less than one-tenth of a second ahead of silver medalist Chad le Clos of South Africa.

[48][49] He concluded the evening session in a tie for fifth-rank with Lewis Burras of Great Britain in the semifinals of the 50 metre freestyle with a time of 20.94 seconds.

[52][53][54] At the 2023 TYR Pro Swim Series in March in Fort Lauderdale, United States, Carter won the gold medal with a personal best and Trinidad and Tobago record time of 48.28 seconds.