[3][4] Rossiter won a bronze medal in the coxless four at the 2017 World Championships in Sarasota, Florida.

At the 2019 European Rowing Championships Rossiter was part of the team that won the gold medal in the fours.

[9] In 2021, he won a second European gold medal when winning the coxless four in Varese, Italy.

[10] In December 2022, he announced his retirement from international rowing in order to join the Americas Cup sailing team.

[11] He was subsequently named as part of the INEOS Britannia crew that challenged for the 2024 America's Cup.