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Give Claude and Kiro modernization superpowers
Code assistants rely on static analysis and struggle to address large, complex, brownfield applications. vFunction provides the context needed to transform, re-architect, refactor or rewrite Java and .NET applications.
From converting monoliths into microservices and transforming databases, to generating the specs and integration tests AI coding tools need, vFunction creates the context required to fully modernize your applications.
monoliths and microservices
One platform to modernize any architecture
vFunction uses data science and runtime insights to visualize and document your system in real time. It then creates the modernization plans, specs, and integration tests needed for AI coding workflows, guiding code assistants to refactor or rewrite monoliths and microservices so they stay scalable and resilient.
How it Works
Modernization step by step
From deep architectural analysis to automated refactoring and rewriting, vFunction enables LLMs to transform complex Java and .NET applications into modular, cloud-ready microservices.
See below how vFunction takes modernization from months to days.
Collect Data
Typical duration: 1-3 days
vFunction collects static and dynamic data from your Java and .NET applications via a locally installed server, capturing flows, call trees, resource access, and dependencies while learning your app’s architecture for detailed mapping and analysis.
For distributed services, vFunction uses OpenTelemetry to capture service interactions and architectural technical debt across your environment.
You determine the target architecture so the platform can generate a refactoring plan to move from the current state to the desired one.
Visualize & Analyze
Typical duration: 1-3 days
Use the collected data to visualize your architecture, revealing service boundaries, dependencies, and interactions.
Identify domain boundaries, anti-patterns, and sources of complexity to set the stage for precise, high-impact modernization.
Visualization includes sequence diagrams, C4 diagrams and vFunction’s domain driven visualization.
Plan & Modularize
Typical duration: Days to weeks
vFunction compares your target architecture to collected metrics, generating to-dos to fix issues and modularize code. It produces detailed prompts to resolve architectural issues required for modularization.
Through the MCP server and plugins (Claude, VSCode, Kiro Powers), vFunction integrates with code assistants and integrated development environments (IDEs) to refactor your code or to generate specs of the modular components for code assistants to rewrite those modules from scratch.
Based on production flows, vFunction generates integration tests to ensure coverage when refactoring the application.
Extract/Rewrite Services
Typical duration: 1-2 days
Once code is refactored, vFunction automatically guides the code assistants to extract domains into separate services, generating APIs, client libraries, and documentation—streamlining the move from monolithic to modular architecture.
Alternatively, vFunction can generate specs of those modules to allow code assistants to completely rewrite and test them—well architected, tech-debt-free.
Modernize Frameworks & Databases
Typical duration: 1-2 days
Use code assistants' built-in features (or tools like AWS Transform) to modernize frameworks for domains, services, or modules defined by vFunction — e.g., .NET Framework to .NET 10, Apache Struts Forms to REST, or JEE to Spring Boot. Modernizing at the module level, rather than across an entire multi-million-line application, is the most reliable path to success.
vFunction also converts SQL Server, Oracle, and DB2 to PostgreSQL via intelligent schema conversion, stored procedure transformation, and coordinated refactoring guided by vFunction's domain design - cutting licensing costs and enabling a move to cloud-native databases.
Where do code assistants fall short?
Code assistants rely on static analysis and lack the system-wide architectural context required to modernize large, complex brownfield applications. vFunction provides that context, enabling deterministic, tested, large-scale refactoring, and rewriting.
Lack of domain context
LLMs recognize syntax patterns but fail to recognize business domains or define “bounded contexts.”
No runtime awareness
Suggestions are based on static analysis; assistants cannot observe how code actually behaves under load or how data flows during execution.
Greenfield bias
Code assistants are optimized for writing new code, rather than the surgical, behavior-preserving refactoring needed to extract legacy components.
Fragmented global view
Token limits prevent assistants from “seeing the big picture” of a million-line monolith, causing them to miss tangled dependencies.
Operational blind spots
They often ignore the complexities of distributed systems, such as eventual consistency, inter-service latency, and failure modes.
Prompt fragility and inconsistency
Output varies wildly by prompt, making it difficult to maintain a unified architectural standard across a multi-service decomposition.
Platform Capabilities
Visualize your true architecture
Patented static and dynamic analysis automatically identify flows, domain boundaries, dependencies, and architectural technical debt. Modernize complex Java and .NET applications with the only platform that provides domain-driven design context for GenAI code assistants, enabling faster, more accurate refactoring and rewriting.
Your actionable modernization plan
vFunction automatically generates detailed modernization plans with comprehensive prompts prioritized by business impact and optimized for GenAI remediation.
- Configure automated alerts based on your goals
- Filter tasks by domain, status, priority, type, and more
- Generate architectural prompts for code assistants
- Export tasks for use in tools like Jira and Azure DevOps
- Address technical debt across monoliths and distributed environments
- Generate specs to rewrite individual services, or the full monoliths into modern microservices
- Generate integration tests to test rewritten or extracted modules
Real-time architectural documentation
Traditional architecture diagrams quickly become outdated. vFunction continuously captures architectural changes to generate real-time sequence diagrams, service maps, domain maps, and C4 diagrams, helping teams diagnose and automatically remediate issues faster with code assistants.
Secure by design
vFunction runs entirely within your environment, behind your firewall or under your cloud provider’s security, so your data never leaves your control.
With ISO 27001 certification, vFunction meets the highest standards for protecting sensitive information.
Case Study
How a global consumer brand modernized the app that runs everything
Ecosystem
Built to work with your stack
From cloud providers to code assistants, vFunction connects with the tools you already use to power your architectural modernization and management journey.
Maximize cloud value
vFunction works closely with leading cloud providers on technology integrations and programs that accelerate your path to cloud-native. From cloud competencies to proof-of-concept projects to full-scale funding initiatives, we help you get the most value from the cloud.
Architectural intelligence for your code assistants
vFunction brings architectural context into your GenAI workflows—feeding optimized prompts into assistants through our MCP server or VS Code extension.
Seamless program management and collaboration
vFunction integrates with tools like Jira, Azure DevOps, and Slack to keep modernization projects moving smoothly. From executing TODOs to efficient team collaboration, we make architectural improvements easier for you to track, manage, and deliver.
Built on a strong core
With deep expertise in Java and .NET and integration with OpenTelemetry, we extend architectural modernization and management across diverse stacks to ensure architectural modernization and management fits your unique environment.
“vFunction addressed a critical need for us to take thousands of our enterprise applications and modernize them through the use of an extremely powerful automated platform."
Flavio Fasano
Senior Solution Architect, Intesa Sanpaolo Bank
Resources
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