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CASE 02 · MULTINATIONAL BANK · CORE MODERNIZATION

Digital transformation of legacy banking systems

Industry
Banking & finance
Services
Digital Transformation · Cloud
Timeline
18 months, quarterly wins
Stack
Azure · Kubernetes · Event streaming
50+
legacy apps migrated
0
downtime during cutover
−60%
operational costs
system performance
The challenge

A multinational bank was running its core operations on 50+ aging applications — expensive to operate, slow to change, and increasingly hard to keep compliant. Every previous modernization attempt had stalled on the fear of downtime.

The solution

We ran a strangler-fig migration: wrapping legacy systems in APIs, carving out services one by one to cloud-native microservices, and staging every cutover behind feature flags with instant rollback. Compliance controls were built into the platform, not bolted on.

The results

All 50+ applications reached the cloud with zero downtime. Operational costs dropped 60%, performance tripled, and release cycles went from quarterly to weekly — with a cleaner audit story than the legacy estate ever had.

SYSTEM AT A GLANCE
01Legacy estate wrapped in APIs50+ applications, strangler-fig pattern
02Service extractionDomain by domain, behind feature flags
03Cloud-native platformMicroservices on Azure + event streaming
04Staged cutoversInstant rollback — zero downtime

They did the thing every vendor promised and none delivered: modernized the core without a single minute of downtime.

CTO, RETAIL BANKING · MULTINATIONAL BANK