Real Migration Success Stories
See how I've helped organizations migrate from legacy J2EE to modern Spring Boot, eliminate WebLogic licensing costs, and enable cloud-native deployment—all without business disruption.
E-commerce Platform: Legacy Spring to Spring Boot Cloud-Native
National Retail Chain
The Challenge
A national retail chain operated an e-commerce platform built on legacy Spring Framework 3.2 with XML configuration. The monolithic application was deployed to on-premise servers, making scaling during peak seasons (Black Friday, holidays) extremely expensive and slow. The platform handled $500M in annual online revenue but couldn't scale quickly enough during traffic spikes. Infrastructure costs were high, deployment velocity was slow (monthly releases), and the development team struggled with the aging codebase. Critical requirements: - Must handle 100x traffic spikes during sales events - Need to reduce infrastructure costs - Cannot risk revenue loss during migration - Must enable continuous deployment - Need to modernize without rewriting business logic
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Healthcare Provider Portal: JSF to React Migration
Healthcare Technology Company
The Challenge
A healthcare SaaS provider was running a patient portal built with JSF 2.2 and PrimeFaces. The frontend was slow, mobile-unfriendly, and increasingly difficult to maintain. Competing products had modern, responsive interfaces while theirs felt stuck in 2010. The portal served 500,000+ patients and healthcare providers. The UI was deeply coupled with backend EJB services through managed beans, making frontend changes risky and time-consuming. Key challenges: - Must maintain HIPAA compliance throughout migration - Cannot disrupt active patient sessions or appointments - Development team has no React experience - Need to support mobile devices (60% of traffic) - Cannot afford a "big bang" rewrite
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Financial Services Platform Migration from WebLogic to Spring Boot
Major Financial Institution
The Challenge
A Fortune 500 financial institution was running a critical trading platform on WebLogic 10.3 with 200+ EJB 2.x components. Annual licensing costs exceeded $400K, and the technology stack was preventing cloud migration and attracting modern development talent. The platform processed millions of transactions daily and required 99.99% uptime. Any migration approach that risked downtime or data integrity was unacceptable. Additionally, the development team had deep institutional knowledge of the legacy codebase but limited Spring Boot experience. Key constraints: - Zero tolerance for production downtime - Cannot freeze feature development during migration - Must maintain regulatory compliance throughout transition - Need to reduce infrastructure costs by 60% within 18 months
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