Kemen is a youth exponent from
Metz. He made his
Ligue 1 debut for
Lyon on 28 February 2016 against
Paris Saint-Germain replacing
Rafael after 75 minutes in a 2–1 home win. On 11 January 2017, Kemen joined
Ligue 2 side
Ajaccio on loan until the end of the season. On 12 July 2017, his loan was extended for another season. He signed for
Chamois Niortais in July 2019, and went on to make 62 appearances in
Ligue 2 for the club. On 29 August 2021, after two season with
Niort, Kemen joined
Süper Lig club
Kayserispor for an undisclosed fee, signing a three-year contract. ==International career==