He studied in Tucumán, and then was educated in theology in Buenos Aires at the Real Colegio de San Carlos.
He was elected to Congress to represent Tucumán and served in 1816 for the declaration.
After the Congress moved to Buenos Aires, he resigned his mandate and returned to his hometown.
He collaborated in local politics with his close relative, Bernabé Aráoz, assisting in the 1820 formation of the Republic of Tucumán and serving as a legislator in the provincial assembly.
After the death of Bernabé and the collapse of the Tucumán Republic, Aráoz retired from politics.