The architecture style of Se Cathedral is Portuguese-Manueline. The exterior is Tuscan, whereas the interior is Corinthian. The church is 250 feet in length and 181 feet in breath. The frontispiece stands 115 feet high.
The Se Cathedral's tower houses a large bell known as the "Golden Bell" on account of its rich tone. It is said to be the largest in Goa, and one of the best in the world. The main altar is dedicated to Catherine of Alexandria, and there are several old paintings on either side of it. On the right there is a Chapel of the Cross of Miracles, where a vision of Christ is said to have appeared in 1919. There are six main panels, on which scenes from the life of Saint Catherine are carved. There is a huge gilded reredos above the main altar.