Transform aging, monolithic software into modern, cloud-native architectures without disrupting daily operations. We migrate legacy systems to scalable microservices, replace outdated technologies, and future-proof your infrastructure.
Legacy systems are the silent tax on innovation. They work, often reliably, but they chain your organization to outdated technologies, inflated maintenance budgets, and an ever-shrinking pool of developers who understand COBOL, classic ASP, or decade-old Java frameworks. At Cozcore, our Legacy System Modernization solution provides a clear, low-risk path from where you are today to where your technology needs to be, without the catastrophic risks of a big-bang rewrite.
Our modernization methodology follows the Strangler Fig pattern, incrementally replacing legacy components with modern services while keeping the existing system operational. This approach eliminates the all-or-nothing risk that has derailed countless modernization projects. We start by mapping the entire legacy landscape: understanding data flows, business rules embedded in code, undocumented integrations, and the tribal knowledge that keeps the system running. This discovery phase is critical because the biggest risk in modernization is not the new technology but the business logic that lives only in the old code.
We have modernized systems ranging from 15-year-old .NET monoliths to mainframe COBOL applications processing millions of financial transactions daily. Our team includes engineers who have deep experience with both legacy stacks and modern cloud-native technologies, allowing us to bridge the gap between old and new without losing critical business functionality. The result is a modern, maintainable system that runs faster, costs less to operate, and enables your team to deliver new features at the pace your business demands.
This solution is designed for organizations that match these profiles
Enterprises spending over 70% of their IT budget on maintaining legacy systems instead of building new capabilities, and who need a systematic path to reduce that maintenance burden.
Organizations whose legacy technology stack makes it increasingly difficult to hire and retain developers, creating key-person risk and slowing down even minor changes.
Companies facing compliance or security mandates that require upgrading from end-of-life platforms like Windows Server 2012, classic ASP, or unsupported database versions.
Businesses whose legacy systems cannot integrate with modern SaaS tools, mobile applications, or partner APIs, limiting their ability to compete in a connected marketplace.
Built for the people and teams who need it most
Enterprises running critical applications on outdated technology stacks
Organizations struggling with high maintenance costs for legacy software
Companies facing scalability limitations from monolithic architectures
IT leaders tasked with digital transformation initiatives
Get a detailed project estimate and timeline within 48 hours
A proven methodology refined across dozens of legacy system modernization engagements
Comprehensive analysis of the existing system including architecture mapping, dependency identification, code quality assessment, technical debt quantification, and business rule extraction from legacy code.
Define the target architecture, select migration patterns (Strangler Fig, CQRS, event sourcing), prioritize components based on business value and risk, and create a phased roadmap with clear milestones.
Migrate databases from legacy platforms to modern systems with schema redesign, data cleansing, and continuous replication to maintain synchronization during the transition period.
Incrementally extract business capabilities from the monolith into independent microservices with well-defined APIs, running in parallel with the legacy system during transition.
Side-by-side comparison testing to verify the modernized system produces identical outputs to the legacy system. Automated regression suites ensure no business logic is lost during migration.
Gradual traffic shifting from legacy to modernized system with real-time monitoring, rollback procedures, and final decommissioning of legacy components once stability is confirmed.
Enterprise-grade technologies powering our legacy system modernization solution
Transparent expectations for scope, timing, and budget
3-9 months depending on system complexity and scope
Starting from $50,000 for targeted module modernization; $150,000-$500,000+ for full system transformation
Measurable outcomes you can expect from this solution
Reduce maintenance costs by up to 60% with modern architectures
Eliminate vendor lock-in and end-of-life technology risks
Improve system performance and response times by 5-10x
Enable faster feature delivery with modular, testable code
Enhance security posture with current frameworks and practices
Concrete deliverables included in every legacy system modernization engagement
Comprehensive legacy system audit and modernization roadmap
Migrated application with modern technology stack
Automated CI/CD pipeline for continuous delivery
Data migration with zero data loss validation
Knowledge transfer documentation and team training
Real results from our legacy system modernization engagements
Migrated a 20-year-old COBOL transaction processing system to cloud-native microservices over 7 months. Processing time dropped from 45 minutes to under 2 minutes with zero data discrepancies.
Modernized a patient management system from .NET Framework 2.0 to .NET 8 with a React frontend. Maintenance costs dropped 55% and the team shipped 12 new features in the first quarter post-migration.
Decomposed a monolithic Java ERP into 14 microservices over 5 months. Page load times improved by 8x and deployment frequency increased from monthly to multiple times per day.
What sets our legacy system modernization solution apart
We never do big-bang rewrites. Our incremental approach keeps your business running while we modernize piece by piece, delivering value at every milestone.
Our engineers read COBOL, classic ASP, and legacy Java as fluently as they write modern TypeScript and Go. We understand both sides of the migration bridge.
We treat your legacy code as a specification, not just old software. Every business rule is documented, tested, and verified in the modernized system.
Your operations never stop. We run old and new systems in parallel with automated validation and instant rollback capabilities throughout the migration.
Engineering capabilities that power this solution
Tailored software solutions designed to solve your unique business challenges. We build scalable, secure, and maintainable enterprise applications.
🌐Modern, responsive, and high-performance web applications built with cutting-edge technologies and best practices.
📱Native and cross-platform mobile applications for iOS and Android that deliver exceptional user experiences.
⛓️Secure, transparent, and decentralized blockchain solutions including smart contracts, DApps, and cryptocurrency platforms.
Scale your team with pre-vetted senior engineers who specialize in the technologies behind this solution.
Hire DevelopersTell us about your project and get a free consultation with our senior engineers. We will map the right approach, timeline, and investment for your specific needs.