During his law school, Belmonte served as legislative staff of then-4th district Representative
Feliciano Belmonte Jr. as the Paralegal Program Officer for Empowering Civic Participation and Governance before co-founded the Belmonte Sison Sawali and Associates. He became consultant for
Liga ng mga Barangay in Quezon City and administrator of Banlat area under Office of the Mayor. He also became a consultant for Office of the Presidential Adviser on political affairs under the Office of the President. In 2022, Belmonte served as a lawyer for Juanito Jose Remulla, the son of
Jesus Crispin Remulla for his drug possession case. ==Political career==