He is the principal of his directorial firm FLM Creatives and Productions, handling several projects with the largest broadcasters and producers in the Philippines.
[2] Mamaril started working in ABS-CBN as a production assistant and began directing television programs for Metro Channel.
[6][7][8][9][10][11] Mamaril directed the music video of revived single Makita Kang Muli by Ebe Dancel and Regine Velasquez.
[13] Mamaril directed the 20th anniversary concert of OPM rockband Aegis at the Smart Araneta Coliseum, marketed as 20ble Dekada (Two Decades).
[17] Mamaril directed music videos for singles by other top Filipino artists Vice Ganda, 4th Impact, Janella Salvador, Kim Chiu, Vina Morales, Ronnie Alonte, Jason Dy, Michael Pangilinan, Kakai Bautista, Enchong Dee, Darren Espanto, and Morissette among others.