Jääskeläinen was sent to ten European Championships from 1985 to 1994, achieving his best result, eighth, at the 1993 event in Helsinki. He also competed at nine World Championships and reached his highest placement, 12th, at the 1991 event in Munich. Jääskeläinen was selected to represent Finland at the 1992 Winter Olympics in Albertville and finished 19th. During his career, he trained at the Mariposa School of Skating in Barrie, Ontario, Canada.