Before he played in the NHL, Janecyk played at Chicago State University. He also played for the Fort Wayne Komets and Flint Generals of the IHL, as well as the New Brunswick Hawks, Springfield Indians, and the New Haven Nighthawks of the AHL. During his time with the New Brunswick Hawks in the 1981–82 AHL season, he won the Harry "Hap" Holmes Memorial Award. He also won the Ken McKenzie Trophy in the 1979-80 IHL season during his time with the Fort Wayne Komets. He retired from professional ice hockey in 1988.