Muniz started his career travelling back and forth between his hometown and Rio de Janeiro, training with the likes of Thiago Santos and Luis Henrique at Tata Fight Team, and earning extra money on the side as a personal trainer to make ends meet in between fights. Starting off with a decision win over former PRIDE star and WEC middleweight champion Paulo Filho at the Bitetti Combat 19 event on February 6, 2014, Muniz would go on to win 10 out of the next 11 bouts between 2014 and 2018, culminating in being offered a chance on Dana White's Contender Series.
