No cursus honorum for Julius Major has yet been recovered, but evidence for a number of offices he held have been recovered. The earliest office known for him is legatus legionis or commander of Legio III Augusta, which was stationed at Lambaesis in Numidia (which Syme notes "normally carried designation to a consulship") in 125 and 126.[1] Following his consulship, Major was appointed governor of the imperial province of Moesia Inferior between 131 and 135,[2] then governor of the important imperial province of Syria from 137 to 139.[3]
Julius Major concluded his career by holding a proconsulate in 141/142, but opinion is divided whether he was proconsul of Africa or Asia: Syme notes the evidence supports either province, although he believes it is likely Julius was proconsul of Asia,[1] an opinion Géza Alföldy concurs with.[4]