The American Express core payments ecosystem is a global platform relied on by Card Members and partners around the world. Every day, it processes live payment transactions that require high availability, low latency, and predictable performance. Resiliency is not an afterthought; it has been encoded into the system’s design from the beginning. Localized faults are contained within defined boundaries, and recovery is designed to be fast and predictable. To achieve this, the platform is built around a cell-based architecture that isolates failures, maintains low-latency processing, and scales capacity without expanding the failure domain. This blog outlines the principles that guide this architecture and how they help us build a resilient payments latform at global scale. Core Payments Ecosystem In 2018, we started a journey to modernize our core payments ecosystem. This platform processes live card and payment transactions and is mission-critical to our Card Members and partners.…