From Legacy to Cloud: A Migration Success Story

When a major insurance company approached us, their 15-year-old platform was struggling: slow performance, expensive maintenance, and an inability to ship new features. Here's how we transformed it without disrupting their business.

The Challenge

The existing system was built on classic ASP and VB6 - technology that's increasingly difficult to maintain. Finding developers was nearly impossible, and every change carried risk. The company needed to modernize but couldn't afford downtime.

Our Approach: Strangler Fig Pattern

Instead of a risky big-bang rewrite, we used the strangler fig pattern. We built new microservices in .NET Core that gradually replaced legacy functionality. Both systems ran in parallel, with traffic gradually shifted to the new platform.

Key Results

• 80% faster application performance
• 40% reduction in infrastructure costs
• Zero downtime during migration
• Modern codebase that developers actually want to work on
• Deployment frequency increased from monthly to daily

Lessons Learned

The biggest lesson: don't try to modernize everything at once. Start with high-value, low-risk components. Build confidence and momentum before tackling the core systems. And always maintain the ability to roll back.