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Financial Services

Enterprise Legacy Migration — Fortune 500 Financial Services 14 Modules Migrated

Led architecture for migrating a decade-old monolithic .NET platform with 2M+ lines of code to cloud-native microservices for a Fortune 500 financial services client, with zero downtime across the full migration.

ClientPublicis Sapient
Duration18 months
Team Size8+ engineers

The Challenge

A decade-old monolith with 2M+ lines of code, tightly coupled modules, and zero test coverage was blocking feature delivery and carrying significant operational risk for a Fortune 500 client.

Our Solution

Applied a strangler fig pattern, carving out domain-driven bounded contexts and migrating them incrementally over 18 months with zero customer-facing downtime — re-platforming onto Azure with Cosmos DB and Service Bus for event-driven communication between services.

Technologies Used

.NET CoreAzureCosmos DBService BusTerraformReact

The Results

14
Modules Migrated
Zero-downtime migration across all modules
70% faster
Feature Delivery
After full migration to microservices
$1.2M/yr
Infra Savings
Annual infrastructure cost reduction
2M+ lines
Codebase Migrated
From monolithic .NET to cloud-native services

“Migrated our legacy monolith to microservices with zero customer-facing downtime.”

— Director of Engineering, Fortune 500 Financial Services

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