For the sustained success of eCommerce businesses, tracking a wide array of operational, financial, and user engagement metrics is vital, necessitating efficient data architectures and robust pipelines. A scalable event-driven architecture, utilizing platforms like Kafka or AWS Kinesis, captures real-time user actions to decouple data producers and consumers, facilitating high availability across distributed systems. Core metrics such as Customer Acquisition Cost, Lifetime Value, cart abandonment rates, and conversion rates require near-real-time tracking and analysis, often supported by real-time data pipelines and centralized data warehouses. Modern eCommerce analytics integrate advanced machine learning to predict customer behavior, enhance personalization, and optimize strategies. Real-time alerting systems like PubNub and platforms for data visualization, such as Tableau, enable immediate responses to critical issues, while A/B testing and predictive analytics further refine conversion rates and operational efficiency. By transforming raw data into actionable insights, businesses can make proactive decisions, stay ahead of trends, and optimize marketing, sales, and supply chain strategies in response to real-time analytics and evolving market dynamics.