[5] Hirschi is known for his skills as a puncheur and one-day specialist, with wins in the hilly classics Clásica de San Sebastián and La Flèche Wallonne.

[12] Three days later Hirschi took the win at La Flèche Wallonne, pulling away from the rest of the lead group in the last 50 metres of the final climb of the Mur de Huy.

The following month, he was selected for the Tour de France only two days before the start of race after Matteo Trentin was forced to withdraw after testing positive for SARS-CoV-2.

Hirschi started 2023 in Australia, finishing eighth in the Cadel Evans Great Ocean Road Race.

In May, he finished fourth at Eschborn–Frankfurt, before winning stage three of the Tour de Hongrie, taking the race lead in the process.

In August, Hirschi beat Julian Alaphillipe in a two-up sprint to win the Clásica de San Sebastián.

[24] This started a run of five-straight one-day victories for Hirschi, as he won 2024 Bretagne Classic Ouest-France, GP Industria & Artigianato di Larciano, Coppa Sabatini, and Memorial Marco Pantani.