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Tolerating full cloud outages with Monzo Stand-in

Our customers reasonably expect to be able to spend on their card, make bank transfers and pay their bills 24 hours a day, 365 days a year. Their lives don’t have downtime for maintenance so nor should we.

We dedicate a lot of our engineering effort to minimise the risk of downtime during technical migrations and other day-to-day operations, but unforeseen incidents that cause unexpected outages are impossible to eliminate entirely. Disabling Monzo Stand-in is also a conscious decision that engineers make manually, so at the point the Primary Platform’s API becomes available again it doesn’t instantly receive all app traffic again. If you happened to open your Monzo App during this time you would have some clear differences to the usual experience, but the most important tasks like checking your balance, sending and receiving bank transfers and using cards continued working.

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