This paper explores the significant correlation between employee engagement and customer service quality, emphasizing the role of data-driven strategies in enhancing organizational outcomes. The paper highlights the importance of using data analytics to understand and improve employee engagement by analyzing key theories that link engagement to customer satisfaction. It discusses the critical metrics used to measure engagement and how data-driven insights can inform HR strategies, leading to superior customer service. The paper also examines the implications of implementing these strategies, addressing potential challenges such as data privacy, misinterpretation, and cultural resistance. Finally, it suggests future research directions, particularly in integrating emerging technologies like AI and machine learning, to refine engagement strategies further and adapt them to diverse work environments. This review underscores the evolving role of data analytics in HR and its potential to transform employee engagement into a key driver of business success.