His first major result came at the 2010 World Championships in Poznań, Poland, when he won the K-2 500 metres silver medal together with João Ribeiro.

[3] The following year, he secured his second world championship medal in Moscow, after a runner-up finish in the K-4 1000 metres event.

[3] At the European Championships in Brandenburg, Germany, Pimenta finished again in the top-three places of the K-1 5000 and K-4 1000 metres, taking a bronze medal in both events.

[3] In 2016, Pimenta won his first individual continental titles after taking the K-1 1000 and 5000 metres gold medals at the European Championships in Moscow.

[12] During the 3 August 2021 final, Pimenta won the bronze medal with faster time than in the previous round.