Bengt Joacim Karlsson was born on February 13, 1965 in Rödeby and made his IFK Göteborg debut in the 1989 season, which was also the debut season of team mate Thomas Ravelli. At 25 years, 1 month and 22 days, on April 7, 1990, he took part his first competetive game against IFK Norrköping in an Allsvenskan game that ended 0–6. He has spent thre seasons with the IFK Göteborgs first team, and during his career he played in 27 first team games and scored 3 goals. Out of these 27 first team games, 2 were Allsvenskan games.
Joacim Karlsson is with his 2 Allsvenskan games number
446 on the list of those who have competed in most Allsvenskan games for IFK Göteborg. Karlsson won the Swedish championship with IFK Göteborg in 1990. 56 year old Karlsson completed his last season with IFK Göteborg 1991.