Earlier reports that the Captain had only 6100 hours was incorrect. That's his time on the A320 with Air Asia alone.
From a friend who knows Captain Irianto, he started his flying career in the Indonesian Airforce as an F-16 pilot. After military service, he joined Merpati Nusantara Airlines flying the F-28 before flying with Adam Air and later Sriwijaya Air on the 737 before joining Air Asia. He has 20,537 hours TT making him a very experienced operator in this region.