[1] Cosmi played football at Atascocita High School, where he was named to the first-team All-District 21-6A and second team 6A All-State as a senior.

[11] In a game against the West Virginia Mountaineers that season, he caught a pass thrown to him by Sam Ehlinger and ran 21 yards for a touchdown.

[17] Cosmi was named the starting right tackle during training camp and made his professional debut in the opening game of the season.

[22] After missing three games, Cosmi played with a club on his hand in Week 8 but in a reserve role with the Commanders choosing to stick with Cornelius Lucas as the starting right tackle.

Having left in the first half of the Divisional round game against the Detroit Lions due to a knee injury, it was confirmed the next day that Cosmi tore his ACL and would be out for the remainder of the 2024-25 playoffs.