CASE 02 · FINANCE · CLOUD + DIGITAL TRANSFORMATION
Digital transformation of legacy banking systems
THE CHALLENGE
A multinational bank ran its core on decades-old systems: change took quarters, mainframe costs climbed yearly, and every release was a bet-the-weekend event. Regulators demanded resilience the architecture couldn't deliver.
THE SOLUTION
A strangler-pattern migration to cloud-native microservices — each legacy application wrapped, rewritten and cut over behind feature flags, with parallel runs proving correctness before any switch. The business never stopped; customers never noticed.
How we did it
Estate assessment
Inventoried 50+ applications; sequenced by risk, value and dependency.
Platform build
Landing zone with zero-trust security, CI/CD and full observability first.
Strangler migration
Wrap, rewrite, parallel-run, cut over — one service at a time, zero downtime.
Handover
Bank engineers embedded in every pod; they run the platform today.
STACK WE USED
“The migration was flawless. Zero downtime. Our board still asks how it was possible.”
David Miller
VP Engineering, banking client
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