TLDR Tech / Fintech
American Express migrated its payments network twice with zero downtime
American Express migrated its global payments network twice without downtime while processing live card authorization traffic. The team inserted a Global Transaction Router to control traffic, validated a new microservices platform with shadow traffic, and gradually shifted transactions using canary routing. The same traffic control approach later enabled a second migration to a new Kubernetes environment, showing how observability, rollback capabilities, and infrastructure-as-code are critical to modernizing mission-critical financial systems.
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