He was first drafted by the Alaska Aces (then known as the Alaska Milkmen) during the 1995 PBA draft as the sixth overall. During his rookie year, he won the Rookie of the Year Award. And in only his second year in the league, he achieved a rare Grand Slam with the Aces where he was instrumental in that majestic championship run.
Before the start of the 1997 PBA season, Cariaso was traded to the Mobiline Phone Pals (now known as the Talk 'N Text Tropang Texter) where he was a primary offensive threat for the team. After his tenure with Mobiline, he was again sent to the expansion team Tanduay Rhum Masters. He bannered the team alongside Sonny Alvarado and Rudy Hatfield. They won the special 1998 Centennial Cup.
After Tanduay folded in 2001, he was then picked by the Coca-Cola Tigers where he got reunited with Johnny Abarrientos. They won a couple of championships which include the 2002 All-Filipino Cup against his former team Alaska and the 2003 Reinforced Conference against San Miguel. He last tasted a championship with Talk 'N Text prior to this. He also received the most number of awards in his career during his tenure with the Tigers. Also, Coca-Cola was the only team that made it to the finals of all three conferences in 2003.
On April 29, 2014, Cariaso was named as the new head coach of Barangay Ginebra, replacing Ato Agustin. Prior to this, he has no high-level head coaching experience. In fact, he has little coaching experience apart from San Mig Coffee, joining the team in 2011, one year after retiring as a player, to assist his former coach at Alaska, Tim Cone. At San Mig, he emerged as the top assistant, often taking over the reins when Cone was ejected, or when the team was getting blown out and the American coach wanted to send a message to his players.