He played 43 games in the National Hockey League (NHL) between 2003 and 2010 with three teams: the Columbus Blue Jackets, Minnesota Wild, and New York Islanders.

Following his retirement, he became a goaltending coach for the Columbia Valley Rockies of the KIJHL, where his junior ice hockey career began.

After tending goal for four years at Denver, Dubielewicz was signed as an undrafted free agent by the New York Islanders on May 26, 2003.

On April 8, 2007, in the final game of the season against the New Jersey Devils, after Dubielewicz gave up a goal to John Madden with .7 seconds left in regulation, he rebounded to stop the Devils in the shootout of a 3–2 victory to send the Islanders into the postseason as the 8th seed, eliminating the Toronto Maple Leafs from playoff contention.

[2] Dubielewicz made his post-season debut on April 12, 2007 on the road in game one of the Eastern Conference Quarter-finals against the Buffalo Sabres.

After the season, on June 1, 2008, Newsday reported that Dubielewicz declined the two-way contract extension the Islanders had offered, as he believed that he'd be assigned to the AHL, as Joey MacDonald had a one-way deal.