In large-scale eCommerce, architects frequently grapple with scalability and performance bottlenecks, especially during peak sales events and promotional periods. Managing vast amounts of distributed data, ranging from extensive product catalogs and user profiles to real-time inventory and order histories, introduces significant challenges in ensuring consistency and efficient synchronization across various services. Integrating diverse third-party services like payment gateways, shipping APIs, and marketing platforms often leads to complex dependency management and potential points of failure. Furthermore, maintaining high availability and fault tolerance across a multitude of microservices, crucial for 24/7 operation, is a constant concern. Addressing stringent security requirements for sensitive customer and payment data, alongside robust fraud detection, also demands careful architectural design. Finally, ensuring real-time inventory accuracy across multiple channels and providing personalized user experiences through recommendation engines add further layers of complexity. More details: https://surli.cc/tmpqgx