Sr Simulator Sofware Engineer 1 Position is Available at Quad Cities Nuclear Station in Cordova, Illinois 1 Position is Available at Cantera in Warrenville, Illinois WHO WE ARE As the nation's largest producer of clean, carbon-free energy, Constellation is focused on our purpose: accelerating the transition to a carbon-free future. We have been the leader in clean energy production for more than a decade, and we are cultivating a workplace where our employees can grow, thrive, and contribute.