The rapid expansion of digital technologies has significantly transformed how organizations manage and engage with customers throughout the lifecycle. Intelligent digital interfaces such as adaptive recommendation systems, automated interaction platforms, and conversational technologieshave emerged as critical tools for enabling continuous and personalized customer engagement. This study investigates how intelligent digital interfaces contribute to the transformation of the customer lifecycle by examining the relationships between interface capabilities, customer engagement behavior, and lifecycle performance outcomes. A quantitative analytical framework was employed, integrating variables related to interface intelligence, customer interaction experience, and lifecycle value indicators. Data collected from digital platform users were analyzed using descriptive statistics, correlation analysis, regression modeling, and cluster segmentation techniques to identify patterns in engagement behavior and retention dynamics. The findings reveal strong associations between interface capabilities particularly personalization, responsiveness, recommendation accuracy, and conversational intelligenceand customer engagement intensity. Regression results further demonstrate that these interface capabilities significantly influence customer retention probability and loyalty propensity. Cluster segmentation analysis identifies distinct engagement groups, highlighting differences in how customers interact with intelligent systems across digital environments. Visual analyses further confirm that higher engagement intensity is closely associated with increased lifecycle stability and long-term customer retention. Overall, the study concludes that intelligent digital interfaces function as strategic drivers of customer lifecycle transformation by enabling adaptive, data-driven, and personalized interactions. The findings contribute to a deeper understanding of how digital platforms can leverage intelligent interface technologies to strengthen customer relationships and enhance lifecycle value in modern digital ecosystems.