Beyond Balintawak, he has trained in additional respected systems including  Lucky LucayLucay Combat Kali and Heyrosa De Cuerdas Eskrima, expanding his understanding of Filipino combat methods. Through the Cuentada (counter-for-counter) training method, his teaching focuses on developing timing, precision, reflexes, and adaptability under pressure. Today, Guro Barja teaches students locally and internationally, with practitioners training with him from Brazil, Thailand, Colombia, and St. Lucia.