Janjua went to Fc college Lahore where he completed his Intermediate, later selected in Pakistan Army long course. Janjua is a graduate from the 59th Class of the PMA at the Pakistan Military Academy and the National Defence University (NDU) where he studied political science; he got his commissioned into the Punjab Regiment. His military career saw an active action in Siachen against the Indian Army and commanded a Brigade, as a Brigadier, in 2005. Janjua later coordinated relief operations in Azad Kashmir in the aftermath of the massive earthquake in Pakistan in 2005.