How do banks stay up when a dependency fails?

Banks can reduce the risk of a single failed vendor, API, internal service, or feature-control system causing a broad outage by emphasizing runtime containment rather than waiting for recovery. The approach centers on locally evaluated feature flags, cached configurations, safe startup defaults, and infrastructure-hosted edge layers that continue operating when central services or networks are unavailable. Granular kill switches should isolate the smallest affected capability and include predefined fallbacks such as reverting to prior logic, serving cached data, hiding an unavailable feature, or queuing delayed writes, allowing other banking functions to remain available. The discussion links these practices to the EU Digital Operational Resilience Act, applicable since January 2025, which requires prompt containment, and stresses that organizations should regularly test outage scenarios, including cold starts and unreachable flag services. Because kill switches can also create operational or security risks, their use should be governed as production changes through dual approval, immutable audit records, defined alerts, and evidence that controls and fallback paths work as intended.

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