As a law graduate of Parahyangan Catholic University, Fajar began his career in public-sector oversight and private legal practice. He gained experience in criminal proceedings, corporate transactions, regulatory compliance, and due diligence through the KPK and an international-practice law firm, building a balanced understanding of both contentious and non-contentious matters.

At DNT Lawyers, he has worked on corporate crime, anti-money laundering, industrial relations disputes, and commercial litigation, including high-profile matters such as the Pertamina Patra Niaga case, where he assisted with evidence review, case chronology, and litigation strategy.

He is particularly focused on complex disputes, corporate governance, and regulatory enforcement, combining rigorous legal analysis with practical commercial awareness.