Legacy Application Modernization
- Incremental strangler-fig migrations with no big-bang cutover
- .NET Framework, Java EE, PHP, VB6 and classic ASP expertise
- Characterization tests that lock in existing business rules
- Cloud-ready outcomes on AWS or Azure
Why Legacy Modernization with VN Softverg
Legacy systems often hold years of critical business logic, but they are expensive to maintain, hard to secure, difficult to hire for and slow to change. Rewriting them from scratch is risky; leaving them alone is risky too. Modernization done well finds the middle path.
We start with an assessment of your code, architecture, data, integrations and dependencies, then recommend the right strategy for each component using the familiar options: rehost, re-platform, refactor, re-architect or replace. Most of the time we use an incremental, strangler-fig approach, peeling off functionality into modern services while the old system keeps running.
Typical journeys include .NET Framework to .NET 8, Java EE to Spring Boot, monoliths to containerized microservices, on-premises servers to AWS or Azure, and desktop or VB6 applications to modern web interfaces, all with automated tests protecting existing behavior along the way.
Everything you need, under one roof
Modernization Assessment
Code analysis, dependency mapping, risk scoring and a business case for each application, with a recommended strategy and roadmap.
- Application portfolio assessment
- Technical debt and risk report
- Modernization roadmap with estimates
Framework & Runtime Upgrades
Upgrades from .NET Framework to modern .NET, Java 8 / Java EE to Java 21 with Spring Boot, legacy PHP to Laravel, and AngularJS to Angular or React.
- Upgraded codebase
- Dependency and library replacement log
- Regression test results
Monolith to Microservices
Domain-driven decomposition of monoliths into independently deployable services, introduced gradually behind an API gateway.
- Domain and service boundary map
- Extracted microservices
- API gateway routing configuration
UI Modernization
Replace desktop, VB6, Web Forms or JSP interfaces with responsive web frontends while keeping familiar workflows for users.
- UX audit of existing screens
- Modern responsive frontend
- User training material
Database & Data Migration
Move from aging databases or file-based storage to PostgreSQL, SQL Server or cloud databases with validated, repeatable migration scripts.
- Data migration plan and scripts
- Data validation and reconciliation reports
- Rollback procedure
Cloud Re-platforming
Containerize applications with Docker, deploy to Kubernetes, Azure App Service or AWS ECS, and add CI/CD, monitoring and autoscaling.
- Dockerfiles and deployment manifests
- Infrastructure-as-code templates
- CI/CD pipeline and monitoring
Measurable from day one
Incremental releases with rollback plans at every stage.
Characterization tests around key business flows before code changes.
Typical time to a complete assessment and roadmap per application.
Old and new systems run side by side until outputs are verified.
A clear path from kickoff to results
Assess
Analyze code, data, integrations and business value to rank modernization candidates.
Plan
Choose rehost, re-platform, refactor or replace per component and define a phased roadmap.
Protect
Write characterization tests and set up CI so existing behavior can't silently break.
Migrate Incrementally
Move functionality in slices, running old and new side by side with verified outputs.
Decommission & Optimize
Retire legacy components, tune performance and cloud costs, and hand over documentation.
The right stack for the job
- Lower maintenance and infrastructure costs
- Reduced security risk from unsupported frameworks and operating systems
- Faster feature delivery on a modern, testable codebase
- Easier hiring and onboarding on mainstream technologies
- Business continuity throughout the migration
- A cloud-ready platform for analytics, AI and integrations
Built for teams like yours
End-of-support platforms
Applications on unsupported .NET, Java, PHP or Windows Server versions.
Monoliths slowing delivery
Large codebases where small changes require long, risky release cycles.
Desktop to web
Client-server or VB6 desktop apps that need to work in a browser or on mobile.
Data center exit
Moving on-premises applications to AWS or Azure as part of a cloud strategy.
Knowledge risk
Systems understood by only one or two people, who need documenting and de-risking.
Incremental modernization is usually lower risk. It delivers value early and keeps the business running. A full rewrite can make sense for small systems or when the existing code has little reusable value. Our assessment will recommend one.
Related services
Cloud Consulting & Migration
Cloud strategy, landing zones and migrations across AWS, Azure and GCP, planned workload by workload so you modernize without disrupting the business.
Learn moreJava & Spring Boot Development
Java and Spring Boot development: microservices, REST APIs, enterprise applications, Java version upgrades and cloud-native deployment on Kubernetes.
Learn moreDevOps & CI/CD Automation
CI/CD pipelines, Infrastructure as Code, Kubernetes and observability that help your teams release more often with fewer failures.
Learn moreReady to start with Legacy Modernization?
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