The article examines the tactics of the defense attorney’s participation in investigative actions within the criminal procedure of the Republic of Kazakhstan. It analyzes the organizational and legal aspects of the defender’s role, the specifics of interaction with pre-trial investigation bodies, and preparation for procedural actions such as interrogations and confrontations. Special attention is paid to the attorney’s responsibilities in ensuring procedural guarantees for suspects and defendants, documenting violations, monitoring the objectivity of evidence collection, and working with official records. The author highlights that tactical decisions made by the defense attorney significantly influence the fairness and effectiveness of the criminal process. The article concludes that an active and professional defense strategy at the pre-trial stage is essential for safeguarding the constitutional right to legal defense.