Jasaitis' first team in the LKL was Sakalai during the 2000-2001 season. In the fall of 2001 he moved to Lietuvos rytas, and played there till 2006. In his first season with the club he was averaging 8 points and 3.6 rebounds per game. Jasaitis returned to Lietuvos Rytas on 31 December 2010.[1] In July 2011 he signed a one-year deal with Türk Telekom B.K.[2] On January 5, 2015 he went back to Lietuvos rytas.[3]
On May 27, 2023, Jasaitis announced his retirement from professional basketball and was set to become an assistant coach for BC Mažeikiai in the 2023–24 season.[7] However, the deal was cancelled as Jasaitis decided to continue his playing career with Orlandina Basket of the Italian third-tier Serie B.[8]