[2][3] Mundaca made his professional debut in the Chilean Primera División match against Audax Italiano on 28 March 2024.
As an anecdote, he joined the first team after the manager Fernando Díaz needed one player to finish a training session.
[4] He stood out in his second official match against Cobreloa on 7 April of the same year by scoring twice, surpassing records of players such as Alexis Sánchez and Jeisson Vargas.
[7] With Coquimbo Unido, Mundaca also competed at the 2024 Copa Sudamericana, with appearances against Sportivo Luqueño and Racing Club.
[10] During 2024, Mundaca was frequently called up to friendly tournaments and training microcycles of the Chile under-20 national team with views to the 2025 FIFA U20 World Cup.