Zero-downtime cloud migration at 99.99% uptime

An EU payments platform had reached the limits of its hosting. The infrastructure was aging, deploys were manual and tense, and scaling meant guesswork. As a system that moves money, it had one hard constraint: it could not go down.

The problem

The platform needed to move to modern, resilient infrastructure — but a payments service can't schedule a maintenance window, and a botched migration would mean failed transactions. The team also lacked the observability to migrate confidently: when something behaved differently after a change, no one could see why quickly enough.

What we built

We moved the platform to a Kubernetes-based setup defined entirely in code, with CI/CD replacing manual deploys and full observability — metrics, traces, and alerts — in place before anything moved. The migration ran live: we shifted traffic gradually behind health checks, with an instant rollback path at every step, so the cutover was a series of small reversible moves rather than one risky event.

Infrastructure-as-code means the environment is now reproducible, and autoscaling matches capacity to real payment volume instead of a fixed, over-provisioned guess.

The result

The platform moved to modern infrastructure without its customers noticing.

• 99.99% uptime maintained throughout the migration
• Cloud spend down 31% through right-sizing and autoscaling
• Deploys are 12× faster and now routine, not risky

The team ships multiple times a day on infrastructure it can reason about.

Figures are anonymized at the client's request.