Jablonsky has composed the soundtracks to the films The Texas Chainsaw Massacre (2003), Steamboy (2004), The Island (2005), Transformers (2007), D-War (2007), Transformers: Revenge of the Fallen (2009), Transformers: Dark of the Moon (2011), Battleship (2012), Ender's Game (2013) (replacing renowned film Composer James Horner), Transformers: Age of Extinction (2014), and Transformers: The Last Knight (2017). He was also a contributor on Team America: World Police (2004) among many others. In addition, he helped compose some of the music to the video game Metal Gear Solid 2: Sons of Liberty, and composed the theme music for BBC's Seven Wonders of the Industrial World in 2003. He also has written music for the television show Desperate Housewives (2004 - 2012) since the fourth episode. His track "Trailblazing" served as the opening theme for WrestleMania X8 and WrestleMania XIX, as well at the Soundtrack to the TNA Hall of Fame induction of Sting.
In February 2015, Jablonsky was hired to compose the score for the film The Last Witch Hunter. He also composed the Soundtrack for Teenage Mutant Ninja Turtles: Out of the Shadows, the sequel to Teenage Mutant Ninja Turtles, and the 2016 Peter Berg film Deepwater Horizon, starring Mark Wahlberg and Kurt Russell.