[5] Rijken competed at the 2014 Junior European Championships, finishing 18th in the all-around and eighth in the parallel bars final.

[8] He then helped the Dutch team finish 11th in the qualification round of the 2015 World Championships, allowing them to qualify for the 2016 Olympic Test Event.

[10] He was then selected to represent the Netherlands at the 2016 Summer Olympics alongside Bart Deurloo, Yuri van Gelder, Jeffrey Wammes, and Epke Zonderland.

[16] Rijken competed with the Dutch team that finished 19th at the 2019 World Championships, meaning they did not qualify for the 2020 Olympic Games.

He was inspired to return to training after watching the Dutch team clinch an Olympic berth at the 2023 World Championships.